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1. Multistep Photochemical Reactions of Polypyridine-Based Ruthenium Nitrosyl Complexes in Dimethylsulfoxide

Author: Nataliia Marchenko, Pascal G. Lacroix, Valerii Bukhanko, Marine Tassé, Carine Duhayon, Martial Boggio-Pasqua, and Isabelle Malfant
Subjects: nitric oxide, DFT computations, photochemistry, ruthenium complexes, Organic chemistry, QD241-441
Abstract: The photorelease of nitric oxide (NO·) has been investigated in dimethylsulfoxide (DMSO) on two compounds of formula [Ru(R-tpy)(bpy)(NO)](PF6)3, in which bpy stands for 2,2′-bipyridine and R-tpy for the 4′-R-2,2′:6′,2″-terpyridine with R = H and MeOPh. It is observed that both complexes are extremely sensitive to traces of water, leading to an equilibrium between [Ru(NO)] and [Ru(NO2)]. The photoproducts of formula [Ru(R-tpy)(bpy)(DMSO)](PF6)2 are further subjected to a photoreaction leading to a reversible linkage isomerization between the stable Ru-DMSO(S) (sulfur linked) and the metastable Ru-DMSO(O) (oxygen linked) species. A set of 4 [Ru(R-tpy)(bpy)(DMSO)]2+ complexes (R = H, MeOPh, BrPh, NO2Ph) is investigated to characterize the ratio and mechanism of the isomerization which is tentatively related to the difference in absorbance between the Ru-DMSO(S) and Ru-DMSO(O) forms. In addition, the X-ray crystal structures of [Ru(tpy)(bpy)(NO)](PF6)3 and [Ru(MeOPh-tpy)(bpy)(DMSO(S))](PF6)2 are presented.
Published: 2020
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2. State of the Art of Boron and Tin Complexes in Second- and Third-Order Nonlinear Optics §

Author: Cristina C. Jiménez, Alejandro Enríquez-Cabrera, Oscar González-Antonio, Javier Ordóñez-Hernández, Pascal G. Lacroix, Pablo Labra-Vázquez, Norberto Farfán, and Rosa Santillan
Subjects: organoboron complex, organotin complex, nonlinear optics, two-photon absorption, Second-Harmonic Generation, Inorganic chemistry, QD146-197
Abstract: Boron and tin complexes have been a versatile and very interesting scaffold for the design of nonlinear optical (NLO) chromophores. In this paper we present a wide range of reports since the 1990s to date, which include second-order (e.g., second harmonic generation) and third-order (e.g., two-photon absorption) NLO properties. After a short introduction on the origin of the NLO response in molecules, the different features associated with the introduction of these inorganic motifs in the organic-based NLO materials are discussed: Their effect on the accepting/donating capabilities of the substituents, on the efficiency of the π-conjugated linkage, and on the topology of the chromophores which can be tuned from the first generation of “push-pull„ chromophores to more sophisticated two- or three-dimensional architectures.
Published: 2018
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3. Two-photon absorption-based delivery of nitric oxide from ruthenium nitrosyl complexes

Author: Pascal G. Lacroix, Isabelle Malfant, Pablo Labra-Vázquez, Norberto Fárfan, Gabriel Ramos-Ortiz, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), International Research Program IRP-MCCM, International French–Mexican Laboratory LIA-LCMMC / CNRS - CONACyT, and ANR-18-CE29-0012,Photochromics,Architectures Moléculaires Multi-Photochromes Innovantes pour la Production de NO et 1O2(2018)
Subjects: Inorganic Chemistry, Photons, Nitric Oxide Donors, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Nitric Oxide, Ruthenium
Abstract: International audience; Since the discovery of the numerous physiological roles exhibited by nitric oxide (NO), ruthenium nitrosyl (RuNO) complexes have been regarded as one of the most promising NO donors, stable, well tolerated by the body and capable of releasing NO locally and quantitatively, under light irradiation. This release can be achieved by two-photon absorption (TPA) processes, which allow the irradiation to be performed in the near infrared domain, where light has its maximum depth of penetration in biological tissues. This review provides a short introduction on the biological properties of NO, on RuNO complexes with photo-releasing capabilities, and on the origin of TPA properties in molecules. Then, the RuNO complexes with TPA capabilities are thoroughly discussed either as monometallic or polymetallic species.
Published: 2022

4. Bimetallic Ruthenium Nitrosyl Complexes with Enhanced Two‐Photon Absorption Properties for Nitric Oxide Delivery

Author: Yael Juarez‐Martinez, Pablo Labra‐Vázquez, Alejandro Enríquez‐Cabrera, Andrés F. Leon‐Rojas, Diego Martínez‐Bourget, Pascal G. Lacroix, Marine Tassé, Sonia Mallet‐Ladeira, Norberto Farfán, Rosa Santillan, Gabriel Ramos‐Ortiz, Jean‐Pierre Malval, Isabelle Malfant, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), IRP-MCCM French-Mexican International Research Program, LIA-LCMMC International Laboratory / CNRS - CONACyT, Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), and Gulli, Marie-Hélène
Subjects: Photons, Photochemistry, Organic Chemistry, Ruthenium nitrosyl, General Chemistry, [CHIM.COOR] Chemical Sciences/Coordination chemistry, Nitric Oxide, Ligands, Ruthenium, Catalysis, Ligand design, Density functional calculations, Two-photon absorption, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Density Functional Theory
Abstract: International audience; One monometallic and three bimetallic ruthenium nitrosyl (RuNO) complexes are presented and fully characterized in reference to a parent monometallic complex of formula [FTRu(bpy)(NO)]3+, where FT is a fluorenyl-substituted terpyridine ligand, and bpy the 2,2’-bipyridine. These new complexes are built with the new ligands FFT, TFT, TFFT, and TF-CC-TF (where an alkyne C≡C group is inserted between two fluorenes). The crystal structures of the bis-RuNO2 and bis-RuNO complexes built from the TFT ligand are presented. The evolution of the spectroscopic features (intensities and energies) along the series, at one-photon absorption (OPA) correlates well with the TD-DFT computations. A spectacular effect is observed at two-photon absorption (TPA) with a large enhancement of the molecular cross-section (σTPA), in the bimetallic species. In the best case, σTPA is equal to 1523±98 GM at 700 nm, in the therapeutic window of transparency of biological tissues. All compounds are capable of releasing NO⋅ under irradiation, which leads to promising applications in TPA-based drug delivery.
Published: 2022

5. Two-Photon-Triggered NO Release via a Ruthenium–Nitrosyl Complex with a Star-Shaped Architecture

Author: Pascal G. Lacroix, Rosa Santillan, Gabriel Ramos-Ortiz, Rana Mhanna, Jean-Pierre Malval, Isabelle Malfant, Andrés Felipe León-Rojas, Norberto Farfán, Margarita Romero Ávila, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Institut de Science des Matériaux de Mulhouse (IS2M), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), PAPIIT (IN222819), PAIP, CONACYT, Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Gulli, Marie-Hélène, Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)
Subjects: Materials science, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, Absorption, Molecular engineering, chemistry.chemical_compound, Absorption spectroscopy, Two-photon excitation microscopy, [CHIM.COOR]Chemical Sciences/Coordination chemistry, General Materials Science, Z-scan technique, Physical and Theoretical Chemistry, Absorption (electromagnetic radiation), No release, 010405 organic chemistry, [CHIM.COOR] Chemical Sciences/Coordination chemistry, 0104 chemical sciences, Ruthenium, chemistry, Coupling (computer programming), Chemical physics, Irradiation, Group theory, Terpyridine, Electron paramagnetic resonance spectroscopy
Abstract: International audience; We report herein a molecular engineering strategy based on the design of a multipolar ruthenium–nitrosyl (Ru–NO) complex with a three-branched architecture. The three Ru–NO units are introduced at the periphery of a highly π-delocalized truxene core bearing three terpyridine ligands. The two-photon absorption capabilities of the complex were investigated by the Z-scan technique. The strong electronic coupling among the individual arms gives rise to a very strong two-photon absorption response (δ800 nm ∼ 1600 GM), which corresponds to a 16-fold enhancement of the capability of a single-arm reference, thereby promoting an efficient light-driven NO release process in aqueous media.
Published: 2020

6. Life and death of slow-moving landslides

Author: Grégory Bièvre, Alexander L. Handwerger, and Pascal G. Lacroix
Subjects: Atmospheric Science, Tectonics, Earth science, Snowmelt, Material supply, Landslide, Precipitation, Pollution, Geology, Nature and Landscape Conservation, Earth-Surface Processes
Abstract: In the most destructive and catastrophic landslide events, rocks, soil and fluids can travel at speeds approaching several tens of metres per second. However, many landslides, commonly referred to as slow-moving landslides, creep at rates ranging from millimetres to several metres per year and can persist for years to decades. Although slow-moving landslides rarely claim lives, they can cause major damage to infrastructure and sometimes fail catastrophically, transitioning into fast-moving landslides that can result in thousands of casualties. In addition, slow-moving landslides are highly erosive features that control the landscape morphology in many mountainous regions (such as the California Coast Ranges or the Apennines). The persistent and long-term motion of slow-moving landslides provides an exceptional opportunity to investigate landslide processes and mechanisms. In this Review, we examine the environmental conditions (such as geology, climate and tectonics) of slow-moving-landslide-prone regions, analyse the forcings (for example, precipitation and groundwater, earthquakes, river erosion, anthropogenic forcings and external material supply) that drive their motion and investigate the subsequent implications of the different forcings on landslide dynamics. We then discuss circumstances in which slow-moving landslides can accelerate rapidly, move large distances or even fail catastrophically. Finally, we provide new perspectives and challenges for future landslide research. Some landslides creep at low velocities of a few millimetres to metres per year, forced by external factors such as rainfall, snowmelt, earthquakes or anthropogenic forcings. This Review discusses the recent advances in understanding slow-moving landslides and examines circumstances where slow-moving landslides can accelerate and fail catastrophically.
Published: 2020

7. Terre en 4D : apport des séries temporelles de modèles numériques d'élévation par photogrammétrie spatiale pour l'étude de la surface terrestre

Author: Pascal G. Lacroix, Laurent Polidori, Simon Gascoin, Etienne Berthier, César Deschamps-Berger, Centre d'études spatiales de la biosphère (CESBIO), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)
Subjects: QA71-90, HE9713-9715, Applied optics. Photonics, Electrical and Electronic Engineering, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Instruments and machines, Cellular telephone services industry. Wireless telephone industry, TA1501-1820, Computer Science Applications
Abstract: International audience; This article presents a review of the applications in geosciences of digital elevation model (DEM) time series from satellite stereoscopic imagery for the observation of geometric changes at the Earth's surface. This method dates back to the beginning of the 2000's as a consequence of the multiplication of imaging satellites. We present the evolution of the data availability from the birth of the method for military purpose to its propagation in the civilian sphere. The various methods used for analysing series of digital elevation models are presented, as well as their applications in glaciology, hydrology, volcanology, seismology and geomorphology. Given the constant improvement of the image quality and resolution, the range of applications should continue to grow.; Cet article présente une revue des applications en géosciences des séries temporelles de modèles numériques d'élévation (MNE) calculés par photogrammétrie spatiale pour l'observation des changements géométriques à la surface terrestre. Les premières utilisations de MNE dans ce contexte émergent au début des années 2000, facilitées par la multiplication des satellites imageurs haute ou moyenne résolution. La disponibilité des images satellite stéréoscopiques est retracée depuis ses débuts militaires jusqu'à sa propagation dans le civil. Les différentes méthodes de traitements de MNE multi-temporels sont présentées ainsi que leur utilisation dans les travaux scientifiques en glaciologie, hydrologie, volcanologie, sismologie, et en géomorphologie. Grâce à l'amélioration constante de la qualité et résolution des images, le spectre des phénomènes observés devrait continuer de s'étendre..
Published: 2020

8. Rain and small earthquakes maintain a slow-moving landslide in a persistent critical state

Author: Edu Taipe, Pascal G. Lacroix, Eric Larose, Jorge Jara, Noélie Bontemps, Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Université Grenoble Alpes (UGA), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Instituto Geológico Minero y Metalúrgico (INGEMMET), École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris)
Subjects: 010504 meteorology & atmospheric sciences, Precipitaciones, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Science, Movimientos en masa, General Physics and Astronomy, 010502 geochemistry & geophysics, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Article, Large earthquakes, Natural hazard, Statistical analysis, lcsh:Science, Deslizamientos, Seismology, 0105 earth and related environmental sciences, Multidisciplinary, Natural hazards, Landslide, General Chemistry, Sismicidad, Geophysics, 13. Climate action, Erosion, lcsh:Q, Geology, Evotranspiración
Abstract: In tectonically active mountain belts, landslides contribute significantly to erosion. Statistical analysis of regional inventories of earthquake-triggered-landslides after large earthquakes (Mw > 5.5) reveal a complex interaction between seismic shaking, landslide material, and rainfall. However, the contributions of each component have never been quantified due to a lack of in-situ data for active landslides. We exploited a 3-year geodetic and seismic dataset for a slow-moving landslide in Peru affected by local earthquakes and seasonal rainfalls. Here we show that in combination, they cause greater landslide motion than either force alone. We also show the rigidity of the landslide’s bulk clearly decreasing during Ml ≥ 5 earthquakes. The recovery is affected by rainfall and small earthquakes (Ml, In this study, the authors show the interaction between seismic activity and rainfalls on landslide movement and how their timing controls landslide stability and motion.
Published: 2020

9. Terrain Deformation Measurements from Optical Satellite Imagery: On-Line Processing Services for Geohazards Monitoring

Author: Pascal G. Lacroix, Floriane Provost, E. Pointal, E. Boissier, Philippe Bally, Jean-Philippe Malet, Marie-Pierre Doin, and D. Michea
Subjects: geography, Digital image correlation, Tectonics, geography.geographical_feature_category, Glacier, Terrain, Satellite imagery, Landslide, Deformation (meteorology), Displacement (vector), Geology, Remote sensing
Abstract: Measuring ground deformation is crucial in many fields of Earth sciences (eg. glaciers, landslides or tectonics) to understand the environmental forcing at work. In this work, we present the processing chain Multi-Pairwise Image Correlation for OPTical images (MPIC-OPT) to compute the ground displacement [1]. The chain is accessible on-line through different platforms (Geohazards Exploitation Platform -GEP- and For M@Ter webservice) allowing an easy access High-Performance Computing (HPC) infrastructures and currently ingest Sentinel-2 L1C data. The application of the method is presented for three use cases: a) to measure the co-seismic displacement of the Palu, Sulawesi (Indonesia) 2018 earthquake, b) to monitor ice velocity of the Khumbu glacier (Nepal), c) to monitor the ground displacement of the Slumgullion landslide (USA).
Published: 2021

10. A massive rock and ice avalanche caused the 2021 disaster at Chamoli, Indian Himalaya

Author: Jakob F. Steiner, Kshitiz Upadhyay, Martin Mergili, David N. Petley, Kaushal Raj Gnyawali, Shashank Bhushan, Mylène Jacquemart, Adam Emmer, Simon Gascoin, M. Dokukin, Simon J. Cook, Abhishek Kumar, Dan H. Shugar, Etienne Berthier, Cameron S. Watson, Matthew J. Westoby, Sandy Harrison, Wolfgang Schwanghart, Summer Rupper, Sara K. McBride, Ulfat Majeed, Irfan Rashid, Simon Allen, A. P. Dimri, F. Ugalde, Christian Huggel, Pascal G. Lacroix, Arnab Muhuri, M. Van Wyk de Vries, Holger Frey, Jeannette Noetzli, Silvan Leinss, John J. Clague, César Deschamps-Berger, Mark McDonnell, Frank Paul, Mats Eriksson, M. Jha, Daniel Farinotti, J. L. Kavanaugh, Andreas Kääb, Jonathan L. Carrivick, Michele Koppes, Jeffrey S. Kargel, Umesh K. Haritashya, Ashim Sattar, Stuart Dunning, Mohd Farooq Azam, Joel Fiddes, Rakesh Bhambri, Kalachand Sain, David Shean, Suraj Mal, Centre d'études spatiales de la biosphère (CESBIO), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), and Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Grenoble Alpes (UGA)-Université Gustave Eiffel-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])
Subjects: geography, Multidisciplinary, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, business.industry, Glacier, F800, 010502 geochemistry & geophysics, 01 natural sciences, Debris flow, 13. Climate action, Satellite imagery, Physical geography, [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, business, Geology, Hydropower, 0105 earth and related environmental sciences
Abstract: International audience; On 7 February 2021, a catastrophic mass flow descended the Ronti Gad, Rishiganga, and Dhauliganga valleys in Chamoli, Uttarakhand, India, causing widespread devastation and severely damaging two hydropower projects. More than 200 people were killed or are missing. Our analysis of satellite imagery, seismic records, numerical model results, and eyewitness videos reveals that~27 × 10 6 cubic meters of rock and glacier ice collapsed from the steep north face of Ronti Peak. The rock and ice avalanche rapidly transformed into an extraordinarily large and mobile debris flow that transported boulders greater than 20 meters in diameter and scoured the valley walls up to 220 meters above the valley floor. The intersection of the hazard cascade with downvalley infrastructure resulted in a disaster, which highlights key questions about adequate monitoring and sustainable development in the Himalaya as well as other remote, high-mountain environments.
Published: 2021

11. Two‐Photon Absorption Properties in 'Push‐Pull' Ruthenium Nitrosyl Complexes with various Fluorenylterpyridine‐Based Ligands

Author: Valerii Bukhanko, Norberto Farfán, Marine Tassé, Rodrigo M. Barba-Barba, Gabriel Ramos-Ortiz, Isabelle Malfant, Rosa Santillan, Pascal G. Lacroix, Andrés Felipe León-Rojas, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Instituto de Quı́mica, Universidad Nacional Autónoma de México, Universidad Nacional Autónoma de México (UNAM), Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), and Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV)
Subjects: 010405 organic chemistry, Chemistry, Photochemistry, chemistry.chemical_element, Ruthenium nitrosyl, Ligands design, 010402 general chemistry, 01 natural sciences, Two-photon absorption, 3. Good health, 0104 chemical sciences, Ruthenium, Inorganic Chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Push pull
Abstract: International audience; Using the compound [RuII(FT)(bipy)(NO)](PF6)3 (FT is the electron‐rich 4’‐(2‐fluorenyl)‐2,2’:6’,2’’‐terpyridine ligand and bipy is 2–2’bipyridine) as a reference, two new compounds are presented in which carbon‐carbon double and triple bonds are inserted between the fluorenyl substituent and the terpyridine to provide an extended conjugation path. The electronic properties of the three complexes are compared experimentally by UV‐visible spectroscopy and computationally by means of the density functional theory. All of them exhibit a capability for NO release under irradiation on their low‐energy transition located in the 400–500 nm range, with a quantum yield around 0.01. Their two‐photon absorption (TPA) cross sections are investigated by the Z‐scan technique at λ=800 nm. While the reference compound exhibits a cross‐section equal to 108 GM, the introduction of double and triple bonds leads to increased cross‐sections equal to 131 GM and 150 GM, respectively. These values are discussed in reference to the two‐level model in use for “push‐pull” dipolar TPA chromophores.
Published: 2021

12. Rockfall and vulnerability of mountaineers on the west face of the Aiguille du Goûter (classic route up Mont Blanc, France), an interdisciplinary study

Author: Guilhem Marsy, Marco Marcer, Ludovic Ravanel, Jacques Mourey, P.A Duvillard, Emmanuel Malet, and Pascal G. Lacroix
Subjects: geography, Rockfall, geography.geographical_feature_category, Mountaineering, Snowmelt, Vulnerability, Climate change, Physical geography, Couloir, Training (civil), Tourism
Abstract: In high alpine environments, climate change leads to an increase in rockfall destabilizations. They represent a threat for sports and tourism activities in high mountain and especially for mountaineering. This danger of rockfall is particularly important on the classic route up Mont Blanc (4,809 m a.s.l., Mont Blanc massif, France), on the west face of the Aiguille du Goûter (3,863 m a.s.l.), and is responsible for at least 29 % of the accidents that occur in this sector. Despite the intensity of the geomorphological processes at work and the vulnerability of climbers, few scientific studies have been carried out on the occurrence of rockfalls and their triggering factors in the Goûter area. Based on a multi-method monitoring system (5 seismic sensors, an automatic digital camera, 3 subsurface temperature sensors, a pyroelectric sensor, a high-resolution topographical survey, 2 weather stations and a rain gauge) the objective of our study is therefore to quantitatively document the occurrence of rockfalls and their triggering factors in the Grand Couloir du Goûter in order to better assess the vulnerability of mountaineers in this sector. Our results show that in the high-Alpine and permafrost-affected Aiguille du Goûter west face, rockfalls are mostly frequent during the snowmelt period which favors the action of thermo-mechanical processes linked to the infiltration of liquid water into the cracks of the rock. During periods when the couloir is completely clear of snow, rockfalls are 2.5 times less frequent, and the thermo-mechanical processes involved in the rockfall triggering are limited by the absence of moisture in the ground. These results also show that climbers' awareness of the risk of rockfalls remains limited. What’s more, they do not adapt – or only slightly – their behavior to this risk, despite a particularly high accident rate. Important work on prevention and dissemination of the knowledge here acquired (newsletters, training for professionals and amateurs, awareness campaigns) among mountaineers is therefore still really necessary.
Published: 2021

13. Far-field coseismic forcing of giant rockslides in the 2017 Sarpol-Zahab Earthquake (Iran)

Author: Aya Cheaib, Najmeh Ajorlou, James Hollingsworth, Pascal G. Lacroix, Swann Zerathe, Marie-Pierre Doin, Chadi Abdallah, and Denis Jongmans
Subjects: Rockslide, Forcing (mathematics), Geology, Seismology
Abstract: On November 12th 2017, the largest earthquake (Mw 7.3) ever recorded in the Zagros mountains occurred near the town of Sarpol-Zahab, Iran. While this region encompasses clusters of giant ancient ro...
Published: 2021

14. Multi-method investigation of mass transfer mechanisms in a retrogressive clayey landslide (Harmaliere, French Alps)

Author: Guillaume Chambon, Sylvain Fiolleau, Pascal G. Lacroix, Marc Wathelet, Denis Jongmans, Michel Demierre, Agnès Helmstetter, Grégory Bièvre, Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Grenoble Alpes (UGA)-Université Gustave Eiffel-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), InfraSurvey Sarl, French VOR federative structure, French national C2ROP project, project SIMOTER 1 - European Union under the ERDF -POIA program, French government under the FNADT -CIMA program, ANR-15-IDEX-0002,UGA,IDEX UGA(2015), and ANR-10-LABX-0056,OSUG@2020,Innovative strategies for observing and modelling natural systems(2010)
Subjects: 021110 strategic, defence & security studies, Earthflow, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], 0211 other engineering and technologies, Landslide, 02 engineering and technology, Slip (materials science), Headscarp, Geotechnical Engineering and Engineering Geology, Retrogression, Aerial photography, Passive seismic, Mass transfer, Natural hazard, Clayey landslide, Multi method, Geology, Seismology, 021101 geological & geomatics engineering
Abstract: International audience; The mass transfer mechanisms in landslides are complex to monitor because of their suddenness and spatial coverage. The active clayey Harmalière landslide, located 30 km south of Grenoble in the French Alps, exhibits two types of behavior: in its upper part, decameter-sized clay blocks slide along a listric slip surface, while a flow-like mechanism is observed in a clayey remolded material a few hundred meters below the headscarp. The landslide underwent a major retrogression affecting 45 ha in March 1981 and has experienced multiple reactivations since then. The last major event took place on the 26th of June 2016, and a large investigation survey was conducted to better understand the reactivation mechanism. A multi-method investigation was carried out at different temporal and spatial scales, including aerial photograph and light detection and ranging processing, correlation of optical satellite images, global navigation satellite system monitoring, continuous seismic monitoring, and passive seismic survey. The morphological evolution of the landslide was traced over the last 70 years, showing a headscarp retrogression of 700 m during multiple reactivations and a total mass transfer of more than 6 × 106 m3. The detailed study of the 2016 event allowed to track and understand the mechanism of a mass transfer of 1 × 106 m3 in 5 weeks, from a sliding mechanism at the headscarp to an earthflow at the toe.
Published: 2021

15. Physicochemical and computational insight of 19 F NMR and emission properties of meso -( o -aryl)-BODIPYs

Author: Armando Ariza, Mónica Farfán-Paredes, Oscar González-Antonio, Rosa Santillan, Norberto Farfán, Pascal G. Lacroix, Diana E. Tahuilan-Anguiano, Jorge Peon, Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Instituto de Quı́mica, Universidad Nacional Autónoma de México, Universidad Nacional Autónoma de México (UNAM), Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Farmácia da Universidade do Porto, Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), CONACYT A1-S-7642, PAIP and PAPIIP IN222819, and French-Mexican International Laboratory (LIA-LCMMC-CONACYT FONCYT 069/2018)
Subjects: 010405 organic chemistry, Aryl, chemistry.chemical_element, General Chemistry, Fluorine-19 NMR, 010402 general chemistry, 01 natural sciences, Catalysis, Spectral line, 0104 chemical sciences, Rotational energy, Electronegativity, chemistry.chemical_compound, chemistry, Computational chemistry, Materials Chemistry, Fluorine, Molecule, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Quantum
Abstract: International audience; A series of electronic and physicochemical parameters were explored to determine their effect on experimental spectroscopic and photophysical data. Through a systematic obtention of a series of meso-(o-aryl)-BODIPYs, 19F NMR spectra were analyzed and their fluorescence quantum yields in several solvents were measured. Experimental values of 19F chemical shift difference ΔδF correlate well with σ-Hammett constants, which is indicative of the inductive nature of the functional groups on the fluorine atoms. A computational DFT exploration of rotational energy barriers, electrostatic potential maps, group electronegativity, charge partitions and hardness/softness provided insight into how those traits can be directly related to the measured features. Expanded understanding of such characteristics provides design arguments and a structure–property relationship, which in a more advantageous way, would help to understand the properties of the synthesized molecules and of future attempts that are structurally related.
Published: 2020

16. Multidecadal elevation changes from spy satellite images: application to glaciers and landslides

Author: Pascal G. Lacroix, Oleg Alexandrov, Alex S. Gardner, Amaury Dehecq, and David Shean
Subjects: geography, geography.geographical_feature_category, Climatology, Elevation, Satellite, Glacier, Landslide, Geology
Abstract: Earth’s surface has evolved dramatically over the last 50 years as a consequence of anthropogenic activities and climate change. The observation of such changes at decadal scales is often limited to sparse in-situ observations. The growth of satellite remote-sensing has enabled such monitoring at regional/global scales but generally over less than two decades.More than 2 million images have been acquired by American reconnaissance (“spy”) satellites on photographic film from the 1960s to the 1980s, and progressively declassified. With near-global coverage and meter to sub-meter resolution, these images have a large potential for many geoscience applications. However the photographic archive represents a unique set of challenges: pre-processing of the scans, correction of the image distortion caused during storing and scanning, poorly known camera positions and parameters. The vast majority of studies using these data rely on tedious manual processing of the data, hindering regional scale applications.Here, we present the existing datasets and the development of an automated processing pipeline. We will focus in particular on images acquired by the Hexagon mapping camera (1973-1980, 12 missions) at 6-9 m ground resolution. A fully automated workflow has been developed to detect the 1081 fiducial markers present on the image, correct for distortion and stitch the different parts of the image, scanned in multiple sections. The pre-processed images are then used to generate Digital Elevation Models (DEMs) at 24 m resolution with the open-source NASA Ames Stereo Pipeline. The developed workflow is able to automatically solve for the unknown camera positions/orientations and optimally aligns the DEMs to an ancillary DEM for the determination of elevation changes. The application to ~600 images has revealed systematic biases in the retrieved elevation, up to 30 m error, linked to uncertainties in the camera parameters (focal length, lens distortion). We present a methodology to refine these parameters using an ancillary DEM only, without use of manual Ground Control Points. The KH-9 elevation is then validated against existing maps in Europe and Alaska and shows a vertical accuracy of ~5 m (68% interval) to 10-15 m (95% interval), sufficient for the study of large surface deformation (glaciers, landslides).Finally, we conclude with several use of these data for the estimation of 40 years geodetic glacier mass balance in Europe and Alaska, and irrigation-triggered landslides in South Peru.
Published: 2020

17. Reactivation of giant paleo-rockslides during the Sarpol-Zahab Mw7.3 earthquake, Iran

Author: James Hollingsworth, Chadi Abdallah, Najmeh Ajorlou, Aya Cheaib, Swann Zerathe, Denis Jongmans, Marie-Pierre Doin, Pascal G. Lacroix, and Gautier Rauscher
Subjects: Rockslide, Seismology, Geology
Abstract: Zagros Mountains form a seismically active fold and thrust belt in western Iran. In addition to the high levels of seismicity, slope failures are common throughout the region, where historical records of very large landslides (> 30 km3) are documented. On the November 12th 2017, the largest earthquake (Mw 7.3) ever recorded in the Zagros occurred near the town of Sarpol-Zahab (NW Zagros/Iraq border). Following the earthquake, only one large co-seismic rockslide and some small rockfalls were documented near the epicenter. This rather small landslide activity for such a large earthquake raises the question of both the observation completeness and the controlling factors of the landslide triggering in this arid mountainous environment. We conducted an original inventory mapping of the landslides induced by this event along 200 km of the Iran-Iraq border. The landslides were detected by different methods: the scars of rapid co-seismic landslides were mapped using a comparison of pre- and post-seismic Planetlab images (3 m resolution), whereas slow-moving landslides (cm/yr-m/yr) were detected by deriving time-series of ground deformation from radar and optical satellite images. Interferometric measurements were constructed for 3 ascending and descending Sentinel-1 SAR tracks, over a time period of 15 months (spanning 6 months before and 9 months after the main shock), allowing the detection and monitoring of very-slow-moving landslides (cm/yr), while slow-moving landslides of higher velocities (m/yr) were detected from correlation of pre and post-earthquake optical satellite images (Planet and SPOT67 imagery; 3 m and 1.5 m resolution, respectively), orthorectified over precise DEMs. We detected 8 giant rotational rockslides (3.106 to 3.107 m2) and 360 small rockfalls (2.102 to 2.104 m2) in our study area. The small slope-failures were concentrated in the steepest areas around the epicenter (within a radius of 45 km) while the giant ones were situated in far fields (150 km far from the epicenter). Geomorphological analysis of the giant landslides revealed the reactivation of huge masses with several hundreds meters scarps at their top and runout distance of several hundreds meters, advancing over a river at their toe. The geodetical analysis of these giant landslides, show their co-seismic acceleration by few cm. Furthermore, the analysis of the displacement time-series of these giant rockslides shows that four of them are destabilized over the longer term. This observation raises question both of the risk posed by these rockslides and the controlling factors of their initiation. A geological and seismological analysis suggests that the triggering of these giant rockslides can be controlled by the geological structure (stratigraphy and folding) and the resulting topography, as well as by the fault mechanism of major earthquakes. Finally, the landslide reactivation mechanism during the Sarpol-Zahab earthquake is discussed.
Published: 2020

18. Chemical and photochemical behavior of ruthenium nitrosyl complexes with terpyridine ligands in aqueous media

Author: Pascal G. Lacroix, Norberto Farfán, Sonia Mallet-Ladeira, Isabelle Malfant, Marine Tassé, Mathilde Bocé, Pablo Labra-Vázquez, Universidad Nacional Autónoma de México (UNAM), Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), CNRS (France), CONACyT, PAPIIT (Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica), Mexico, University Paul Sabatier (COMUE), and Région Midi-Pyrénées - RuNOthérapie grant
Subjects: Aqueous medium, 010405 organic chemistry, Ligand, chemistry.chemical_element, Crystal structure, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, 0104 chemical sciences, Ruthenium, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Density functional theory, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Computational analysis, Terpyridine
Abstract: International audience; The synthesis and behavior in water of a set of various cis(Cl,Cl)-[R-tpyRuCl2(NO)](PF6) and trans(Cl,Cl)-[R-tpyRuCl2(NO)](PF6) (R = fluorenyl, phenyl, thiophenyl; tpy = 2,2′:6′,2′′-terpyridine) complexes are presented. In any case, one chlorido ligand is substituted by a hydroxo ligand and the final species arises as a single trans(NO,OH) isomer, whatever the nature of the starting cis/trans(Cl,Cl) complexes. Six X-ray crystal structures are presented for cis(Cl,Cl)-[thiophenyl-tpyRuCl2(NO)](PF6) (cis-3a), trans(Cl,Cl)-[thiophenyl-tpyRuCl2(NO)](PF6) (trans-3a), trans(NO,OH)-[phenyl-tpyRu(Cl)(OH)(NO)](PF6) (4a), trans(NO,OH)-[thiophenyl-tpyRu(Cl)(OH)(NO)](PF6) (4b), trans(NO,OEt)-[phenyl-tpyRu(Cl)(OEt)(NO)](PF6) (5a), and trans(NO,OH)-[phenyl-tpyRu(Cl)(OEt)(NO)](PF6) (5b) compounds. The different cis/trans(Cl,Cl) complexes exhibit an intense low-lying transition in the λ = 330–390 nm range, which appears to be slightly blue-shifted after Cl → OH substitution. In water, both cis/trans(Cl,Cl) isomers are converted to a single trans(NO,OH) isomer in which one chlorido- is replaced by one hydroxo-ligand, which avoids tedious separation workout. The water stable trans(NO,OH)-species all release NO with quantum yields of 0.010 to 0.075 under irradiation at 365 nm. The properties are discussed with computational analysis performed within the framework of Density Functional Theory.
Published: 2020

19. Tuning the Cell Uptake and Subcellular Distribution in BODIPY–Carboranyl Dyads: An Experimental and Theoretical Study

Author: Norberto Farfán, Arturo Jiménez-Sánchez, Ricardo Flores-Cruz, Pablo Labra-Vázquez, Justo Cabrera-González, Pascal G. Lacroix, Cristian Guzmán‐Cedillo, Rosario Núñez, Aylin Galindo‐Hernández, Rosa Santillan, Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Instituto de Quı́mica, Universidad Nacional Autónoma de México, Institut de Ciència de Materials de Barcelona (ICMAB), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), PAPIIT (IN222819), CONACyT (A1-S-7642), Spanish Ministerio de Economia y Competitividad, MICINN (PID2019-106832RB-100), Generalitat de Catalunya (2017/SGR/1720), Universidad Nacional Autónoma de México (UNAM), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional Autónoma de México, Consejo Nacional de Ciencia y Tecnología (México), Ministerio de Economía y Competitividad (España), and Generalitat de Catalunya
Subjects: Boron Compounds, Fluorophore, Sonogashira coupling, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, Fluorophores, 010402 general chemistry, 01 natural sciences, Catalysis, Imaging, chemistry.chemical_compound, Boron neutron capture therapy, BODIPY, Humans, [CHIM.COOR]Chemical Sciences/Coordination chemistry, 010405 organic chemistry, Organic Chemistry, General Chemistry, Models, Theoretical, Subcellular localization, Fluorescence, 0104 chemical sciences, 3. Good health, Partition coefficient, chemistry, Theranostic, Lipophilicity, BNCT, Biophysics, Carborane, HeLa Cells
Abstract: A set of BODIPY‐carboranyl dyads synthesized by a Sonogashira cross‐coupling reaction, where different C‐substituted ortho‐ and meta‐carboranyl fragments have been linked to a BODIPY fluorophore is described. Chemical, photophysical and physicochemical analyses are presented, including NMR and SXRD experiments, optical absorption/emission studies and log P measurements. These studies, supported by DFT computations (M06‐2X/6‐31G**) provide an explanation to the largely divergent cell income that these fluorescent carboranyl‐based fluorophores display, for which a structural or physicochemical explanation remains elusive. By studying the cell uptake efficiency and subcellular localization for our set of dyads on living HeLa cells, we tracked the origins of these differences to significant variations in their static dipole moments and partition coefficients, which tune their ability to interact with lipophilic microenvironments in cells. Remarkably, m‐carboranyl‐BODIPY derivatives with a higher lipophilicity are much better internalised by cells than their homologous with o‐carborane, suggesting that m‐isomers are potentially better theranostic agents for in vitro bioimaging and boron carriers for BNCT., The work has been performed within the framework of the French-Mexican International Laboratory (LIA-LCMMC). Authors acknowledge support from PAPIIT (IN222819) and CONACyT. The work was supported by Spanish Ministerio de Economía y Competitividad, MINECO (CTQ2016-75150-R) and Generalitat de Catalunya (2017/SGR/1720). Doctoral scholarships were granted by CONACyT to P.L.-V (337958) and R. F.-C. (576635). We thank María E. Ochoa (CINVESTAV-IPN), Marco A. Leyva (CINVESTAV-IPN) and Flor R. Vega (FQ-UNAM) for NMR/HRMS experiments, SXRD experiments and technical support, correspondingly.
Published: 2020

20. Inversion of deformation fields time-series from optical images, and application to the long term kinematics of slow-moving landslides in Peru

Author: Noélie Bontemps, Pascal G. Lacroix, and Marie-Pierre Doin
Subjects: 010504 meteorology & atmospheric sciences, business.industry, 0211 other engineering and technologies, Soil Science, Geology, Landslide, Inversion (meteorology), 02 engineering and technology, Kinematics, Geodesy, 01 natural sciences, Displacement (vector), Term (time), Global Positioning System, Precipitation, Computers in Earth Sciences, business, Decorrelation, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Remote sensing
Abstract: Slow-moving landslides are numerous in mountainous areas and pose a large threat to populations. Many observations show that their kinematics is driven by climatic forcings and earthquakes. In this study, we document the complex interaction between those two forcings on the slow-moving landslide kinematics, based on the retrieval of landslide displacements over 28-years using optical satellite images. To overcome the decorrelation effect over this large time-span, and possible misalignment between images, we develop a method that uses the redundancy of displacement fields from image pairs to derive a robust time-series of displacement. The method is tested on the 28-year long SPOT1/5-Pleiades archive, over an area in Peru affected by both earthquakes and rainfall. Errors are estimated on stable areas and by comparison with one 13-year long and eleven 3-year long GPS time-series on the Maca landslide. The methodology diminishes by up to 30% the uncertainty and reduces significantly the gaps due to decorrelation. The data set allows detecting 3 major landslides, moving at a rate of 35 to 50 m over 28 years, and smaller landslides with lower displacement rates. Time-series obtained over the three main landslides provide interesting results of their long-term kinematics, primarily driven by precipitation. We propose simple statistical hydro-kinematic models, relating yearly motion to seasonal rainfall, to explain the observed time-series. We found that annual precipitation is controlling the landslide displacements after a certain rainfall threshold is reached. Besides this control, we show the possible impact of a local Mw 5.4 earthquake in 1991 on the kinematics of the Maca landslide. Our results suggest that the earthquake accelerated the landslide and has an effect during several years on the precipitation threshold required for triggering a motion. These results suggest that the rainfall threshold can vary in time following strong earthquakes shaking.
Published: 2018

21. Two-photon absorption properties of four new pentacoordinated diorganotin complexes derived from Schiff bases with fluorene

Author: Rosa Santillan, Pascal G. Lacroix, Violeta Álvarez-Venicio, Alejandro Enriquez‐Cabrera, Margarita Romero-Ávila, Gabriel Ramos-Ortiz, Norberto Farfán, Alberto Vega-Peñaloza, Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV)
Subjects: NonLinear optics, 010405 organic chemistry, Organic Chemistry, Chromophore, Fluorene, 010402 general chemistry, DFT, 01 natural sciences, Biochemistry, Two-photon absorption, Fluorescence, Spectral line, 0104 chemical sciences, Inorganic Chemistry, Crystallography, chemistry.chemical_compound, chemistry, Atomic electron transition, Diorganotin complexes, Excited state, Materials Chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, Spectroscopy
Abstract: International audience; In this paper we report the synthesis and characterization of four novel pentacoordinated diorganotin complexes, obtained through a methodology that involves a multicomponent reaction of 4-([9H-fluorene-2-yl]ethynyl)-2-hydroxybenzaldehyde, 2-amino-5-nitrophenol and diphenyl or dibutyl-tin oxides. Diorganotin complexes 8–11 were obtained in high yields (70–80%) and were fully characterized by solution NMR (1H, 13C and 119Sn), high resolution mass spectrometry (ESI-TOF) and ATR-FTIR. The optical properties were investigated by UV/Vis spectroscopy and Two-Photon Excitation Fluorescence (TPEF). The One-Photon Absorption (OPA) spectra shows two bands located around 400 and 500 nm, additionally, in the Two-Photon Absorption (TPA) spectra there is one main band located around 750 nm characterized by maximum values of TPA cross section (σTPA) in the range 450–500 GM with a secondary band located at 1000 nm with maximum σTPA values of 70 GM; the maximum brightness was observed for 2,2-Dibutyl-6-aza-1,3-dioxa-11-([9,9-dihexyl-9H-fluorene-2-yl]ethynyl)-16-nitro-2-stanna-[d,h]dibenzocyclononene with a value of 150 GM. A theoretical approach within the framework of DFT was applied to study the electronic transitions, showing that the 500 nm band is mainly associated to a HOMO→LUMO transition, and the band at 400 nm to a HOMO-1→LUMO transition. As main highlights the quantum efficiency of fluorescence of these excited states is as large as 0.43 due to the presence of the tin atom which favors molecular rigidity, these compounds possess TPA responses which are significantly enhanced with respect to related organotin chromophores previously reported.
Published: 2018

22. Author Correction: Effect of trans(NO, OH)-[RuFT(Cl)(OH)NO](PF6) ruthenium nitrosyl complex on methicillin-resistant Staphylococcus epidermidis

Author: Marie-Pierre Rols, Charlotte Da Silva, Isabelle Malfant, Mathilde Bocé, Pascal G. Lacroix, Flavien Pillet, Marine Tassé, Patricia Vicendo, and Sonia Mallet-Ladeira
Subjects: Multidisciplinary, Chemistry, lcsh:R, lcsh:Medicine, Methicillin-resistant Staphylococcus epidermidis, chemistry.chemical_element, lcsh:Q, lcsh:Science, Medicinal chemistry, Ruthenium
Abstract: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Published: 2019

23. Satellite Pre-Failure Detection and In Situ Monitoring of the Landslide of the Tunnel du Chambon, French Alps

Author: Pascal G. Lacroix, Ombeline Brenguier, and Mathilde Desrues
Subjects: Satellite observation, 010504 meteorology & atmospheric sciences, Pleiades, medium-scale landslides, lcsh:QE1-996.5, pre-failure motions, detection, Geodetic datum, Landslide, 010502 geochemistry & geophysics, Geodesy, 01 natural sciences, Pléiades satellites, lcsh:Geology, satellites, Satellite data, General Earth and Planetary Sciences, Satellite, Stage (hydrology), in-situ geodetic measurements, Geology, 0105 earth and related environmental sciences
Abstract: Recent studies using satellite data have shown a growing interest in detecting and anticipating landslide failures. However, their value for an actual landslide prediction has shown variable results. Therefore, the use of satellite images for that purpose still requires additional attention. Here, we study the landslide of the Tunnel du Chambon in the French Alps that ruptured in July 2015, generating major impacts on economic activity and infrastructures. To evaluate the contribution of very high-resolution optical satellite images to characterize and potentially anticipate the landslide failure, we conduct here a retro analysis of its evolution. Two time periods are analyzed: September 2012 to September 2014, and May to July 2015. We combine Pl&eacute, iades optical images analysis and geodetic measurements from in situ topographic monitoring. Satellite images were correlated to detect pre-failure motions, showing 1.4-m of displacement between September 2012 and September 2014. In situ geodetic measures were used to analyze motions during the main activity of the landslide in June and July 2015. Topographic measurements highlight different areas of deformations and two periods of strong activity, related to the last stage of the tertiary creep and to anthropic massive purges of unstable masses. The law of acceleration toward the rupture observed in June and July 2015 over the topographic targets also fits well the satellite observation between 2012 and 2014, showing that the landslide probably already entered into tertiary creep 2.5 years before its failure.
Published: 2019
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24. Further studies on the photoreactivities of ruthenium–nitrosyl complexes with terpyridyl ligands

Author: Isabelle Malfant, Pascal G. Lacroix, Alix Sournia-Saquet, Silvia Amabilino, Marine Tassé, Isabelle Sasaki, Sonia Mallet-Ladeira, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK., Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), University of Warwick [Coventry], and Centre National de la Recherche Scientifique (CNRS)
Subjects: [SDV]Life Sciences [q-bio], Substituent, Quantum yield, chemistry.chemical_element, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Medicinal chemistry, Catalysis, 3. Good health, 0104 chemical sciences, Ruthenium, chemistry.chemical_compound, chemistry, Nitrosamine, Group (periodic table), Materials Chemistry, Moiety, [CHIM]Chemical Sciences, 0210 nano-technology, Derivative (chemistry), Cis–trans isomerism
Abstract: International audience; This study focuses on the two cis/trans-(Cl,Cl)-[Ru(R-Phtpy)Cl2(NO)]+ isomers, where the R group is a NEt2 substituent on the 4′-position of the phenylterpyridine (Phtpy) moiety. The photophysical characteristic properties of the two isomers and those of one nitrosamine derivative are described. The NO release properties are evaluated and show that the cis isomer is the most efficient with a good quantum yield of NO release. The X-ray structures of three ruthenium–nitrosyl complexes and of a photoproduct are presented.
Published: 2019

25. Self‐Entrainment Motion of a Slow‐Moving Landslide Inferred From Landsat‐8 Time Series

Author: James Hollingsworth, Gael Araujo, Edu Taipe, Pascal G. Lacroix, Institut des Sciences de la Terre (ISTerre), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Observatorio Vulcanológico del INGEMMET (Dirección de Geología Ambiental y Riesgo Geológico) [Arequipa], and Observatorio Vulcanológico del INGEMMET (Dirección de Geología Ambiental y Riesgo Geológico)
Subjects: [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, 010504 meteorology & atmospheric sciences, Series (mathematics), [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], 0211 other engineering and technologies, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Landslide, 02 engineering and technology, Geodesy, 01 natural sciences, Motion (physics), Displacement (vector), Geophysics, [SDU]Sciences of the Universe [physics], Entrainment (chronobiology), Geology, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract: International audience
Published: 2019

26. Effect of trans(NO, OH)-[RuFT(Cl)(OH)NO](PF6) ruthenium nitrosyl complex on methicillin-resistant Staphylococcus epidermidis

Author: Sonia Mallet-Ladeira, Marine Tassé, Flavien Pillet, Pascal G. Lacroix, Charlotte Da Silva, Marie-Pierre Rols, Isabelle Malfant, Mathilde Bocé, Patricia Vicendo, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Institut de pharmacologie et de biologie structurale (IPBS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), IDeAS - Interfaces Dynamiques et Assemblages Stimulables (IDeAS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), French National Center for Scientific Research (CNRS), University Paul Sabatier (COMUE), Région Midi-Pyrénées - RuNOthérapie, Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)
Subjects: 0301 basic medicine, medicine.drug_class, Antibiotics, lcsh:Medicine, Microbial Sensitivity Tests, Article, Ruthenium, Microbiology, 03 medical and health sciences, Methicillin, 0302 clinical medicine, Antibiotic resistance, Staphylococcus epidermidis, medicine, Humans, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Mode of action, lcsh:Science, Author Correction, Multidisciplinary, biology, Chemistry, lcsh:R, Biofilm, Biofilm matrix, Methicillin-resistant Staphylococcus epidermidis, Staphylococcal Infections, biology.organism_classification, 3. Good health, Anti-Bacterial Agents, 030104 developmental biology, Biofilms, lcsh:Q, Methicillin Resistance, 030217 neurology & neurosurgery, Bacteria
Abstract: Antibiotic resistance is becoming a global scourge with 700,000 deaths each year and could cause up to 10 million deaths by 2050. As an example, Staphylococcus epidermidis has emerged as a causative agent of infections often associated with implanted medical devices. S. epidermidis can form biofilms, which contribute to its pathogenicity when present in intravascular devices. These staphylococci, embedded in the biofilm matrix, are resistant to methicillin, which had long been the recommended therapy and which has nowadays been replaced by less toxic and more stable therapeutic agents. Moreover, current reports indicate that 75 to 90% of Staphylococcus epidermidis isolates from nosocomial infections are methicillin-resistant strains. The challenge of successfully combating antibiotics resistance in biofilms requires the use of compounds with a controlled mode of action that can act in combination with antibiotics. Ruthenium nitrosyl complexes are potential systems for NO release triggered by light. The influence of trans(NO, OH)-[RuFT(Cl)(OH)NO](PF6) on Staphylococcus epidermidis resistant to methicillin is described. The results show a 50% decrease in cell viability in bacteria treated with low concentrations of NO. When combined with methicillin, this low dose of NO dramatically decreases bacterial resistance and makes bacteria 100-fold more sensitive to methicillin.
Published: 2019

27. Nitric oxide (NO) photo-release in a series of ruthenium–nitrosyl complexes: new experimental insights in the search for a comprehensive mechanism

Author: Max Roose, Pascal G. Lacroix, Marine Tassé, Isabelle Malfant, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), and Ministère de l’Enseignement Supérieur et de la Recherche (MESR)
Subjects: Ligand, chemistry.chemical_element, Electron donor, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Catalysis, Spectral line, 0104 chemical sciences, Ruthenium, Nitric oxide, chemistry.chemical_compound, Crystallography, chemistry, Intramolecular force, Pyridine, Materials Chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Irradiation, 0210 nano-technology
Abstract: International audience; A series of four ruthenium(ii) complexes built from the [Ru(terpy)(bipy)(NO)](3+) core (terpy is 2,2:6,2-terpyridine and bipy is 2,2-bipyridine) are investigated. They differ by the presence of zero, one, two, or three 4-(4-methoxyphenyl) (MP) electron donor substituents introduced at different positions on the pyridine fragments to increase the intramolecular charge transfer capabilities towards the strongly withdrawing nitrosyl (NO) ligand. The UV-visible spectra reflect the presence and position of the MP substituents on the complexes. In the case of species containing the 4-(MP)-terpy ligand, a low-lying transition is identified as arising from 4-(MP)-terpy to Ru(NO) intramolecular charge transfer, which is further confirmed by TD-DFT analysis. Irradiation performed at = 436 nm on this isolated transition for different complexes leads to quantum yields of NO photo-release equal to 0.002 and 0.011, in a ratio of 6 (instead of 1), which allows concluding non-ambiguously that a single electron transition cannot account for the NO release mechanism.
Published: 2019

28. Detection of Pre-eruptive Seismic Velocity Variations at an Andesitic Volcano Using Ambient Noise Correlation on 3-Component Stations: Ubinas Volcano, Peru, 2014

Author: Eric Larose, Roger Machacca-Puma, Pascal G. Lacroix, Philippe Lesage, Rosa M. Anccasi-Figueroa, Instituto Geológico Minero y Metalúrgico (INGEMMET), Institut des Sciences de la Terre (ISTerre), and Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: Volcano monitoring, 010504 meteorology & atmospheric sciences, Ambient noise level, volcano seismology, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Coda wave interferometry, 010502 geochemistry & geophysics, 01 natural sciences, Coda, eruption precursor, Impact crater, Geochemistry and Petrology, Waveform, coda wave interferometry, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, volcano monitoring, Volcano seismology, Andesite, Horizontal plane, Eruption precursor, Geophysics, Amplitude, Volcano, 13. Climate action, Seismic velocity variation, Seismology, Geology, Ubinas volcano
Abstract: International audience; Volcano monitoring and eruption forecasting are based on the observation and joined interpretation of several precursory phenomena. It is thus important to detect new types of precursor and to study their relationship with forthcoming eruptions. In the last years, variations of seismic velocity have been observed in some volcanoes, mainly basaltic, before eruptions. In this paper, we look for velocity variations and waveform decorrelations before the 2014 eruptive sequence of the andesitic Ubinas volcano in Peru. We compute velocity changes by using seismic ambient noise cross-correlation (between pairs of stations) and cross-components correlation (between vertical and horizontal components of single stations), as well as coda wave interferometry of seismic multiplets. With these different approaches, we show that the major explosions that occurred from 13 to 19 April were preceded by a clear velocity decrease and waveform decorrelation. The amplitude of velocity change is generally larger on single-station cross-components correlation than on two-stations cross-correlation in all the frequency ranges tested (between 0.1 and 8 Hz). We highlight an apparent anisotropy of velocity change in single-station cross-components correlation, with larger amplitudes when correlating vertical and tangential components than using vertical and radial components with respect to the crater. The Mw = 8.1 Iquique earthquake on 1 April 2014 produced also a marked co-seismic velocity drop detected in a high frequency range (3-5 Hz) in both single-station cross-components correlation and cross-correlations. We locate in the horizontal plane and in depth the velocity perturbation and the structural change related with decorrelation. During the main phase of eruptive activity, the velocity decrease at low frequency (0.1-1 Hz) appears to affect the whole edifice mainly at depth of about 1 to 3 km below the surface. The structural perturbation is more concentrated on the south flank of the volcano, a zone that corresponds to an ancient collapse. We suggest that the observed velocity variations are due to the dilatation of the edifice and to microfracturation induced by magma pres-surization. The structural change may be locally enhanced by a possible zone of material weakness in the southern sector. The co-seismic velocity perturbation is located mostly in the southeast flank, at depth smaller than 0.5 to 1 km, and may be related to the presence of the hydrothermal system of the volcano.
Published: 2019

29. State of the Art of Boron and Tin Complexes in Second- and Third-Order Nonlinear Optics §

Author: Pascal G. Lacroix, Alejandro Enriquez‐Cabrera, Cristina C. Jiménez, Norberto Farfán, Javier Ordóñez-Hernández, Oscar González-Antonio, Rosa Santillan, Pablo Labra-Vázquez, Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV)
Subjects: Materials science, Nonlinear optics, Second-Harmonic Generation, chemistry.chemical_element, Organotin complex, 010402 general chemistry, 01 natural sciences, Two-photon absorption, Inorganic Chemistry, lcsh:Inorganic chemistry, Molecule, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Boron, Topology (chemistry), Organoboron complex, 010405 organic chemistry, business.industry, Second-harmonic generation, Chromophore, lcsh:QD146-197, 0104 chemical sciences, chemistry, Optoelectronics, Tin, business
Abstract: International audience; Boron and tin complexes have been a versatile and very interesting scaffold for the design of nonlinear optical (NLO) chromophores. In this paper we present a wide range of reports since the 1990s to date, which include second-order (e.g., second harmonic generation) and third-order (e.g., two-photon absorption) NLO properties. After a short introduction on the origin of the NLO response in molecules, the different features associated with the introduction of these inorganic motifs in the organic-based NLO materials are discussed: Their effect on the accepting/donating capabilities of the substituents, on the efficiency of the _-conjugated linkage, and on the topology of the chromophores which can be tuned from the first generation of “push-pull” chromophores to more sophisticated two- or three-dimensional architectures.
Published: 2018

30. Enhanced NLO properties of molybdenum push–pull coordination compounds with tridentate ONO organic ligands

Author: Héctor García-Ortega, Norberto Farfán, Tomás Alonso Guerrero, Pascal G. Lacroix, Omar G. Morales-Saavedra, Dominique Agustin, Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratorio de Óptica No Lineal, Centro de Ciencias Aplicadas y Desarrollo Tecnológico [México] (CCADET-UNAM), Universidad Nacional Autónoma de México (UNAM), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, IUT 'A' - Département de Chimie [Castres], Institut Universitaire de Technologie - Paul Sabatier (IUT Paul Sabatier), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées
Subjects: chemistry.chemical_classification, 010405 organic chemistry, Inorganic chemistry, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Coordination complex, Inorganic Chemistry, Nonlinear optical, chemistry, Molybdenum, Materials Chemistry, Physical chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Thermal stability, Physical and Theoretical Chemistry, Tin, Boron, Push pull
Abstract: International audience; Nonlinear optical (NLO) properties of push-pull Mo complexes with ONO tridentate ligands have been studied. The compounds were obtained in high yields using multicomponent reactions and their structures were confirmed by NMR, IR and HRMS analysis. Furthermore, TGA studies revealed good thermal stability of the Mo complexes. The linear and NLO properties evidenced enhanced responses compared with their boron and tin analogs, indicating that Mo complexes should be further investigated as robust building blocks for NLO materials.
Published: 2016

31. Morphology, structure and kinematics of a rainfall controlled slow-moving Andean landslide, Peru

Author: Bertrand Guillier, Lionel Fídel Smoll, Swann Zerathe, Lucile Tatard, Jersy Mariño, Walter Pari, Denis Jongmans, Edmundo Norabuena, Edu Taipe, Marc Wathelet, and Pascal G. Lacroix
Subjects: 010504 meteorology & atmospheric sciences, Landslide classification, Geography, Planning and Development, Landslide, Silt, Induced seismicity, 010502 geochemistry & geophysics, 01 natural sciences, Aerial photography, Earth and Planetary Sciences (miscellaneous), Erosion, Electrical resistivity tomography, Structural geology, Geomorphology, Geology, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract: The large slow-moving landslide of Maca is located in the upper Colca valley (southern Peru), a region characterized by a well pronounced rainy period, and intense and recurrent sustained seismicity. The landslide, developed in deep lacustrine deposits, has recently accelerated, threatening the Maca village. This work aims at understanding the rupture mechanism and the causes of the recent landslide reactivation/acceleration. We present a multidisciplinary characterization of the Maca landslide that includes: (i) geological and morphological mapping in the field; (ii) remote sensing analysis using an historical aerial photograph of 1955 and the Pleiades satellite images (2013); (iii) global positioning system (GPS) including time-series of surveys over 13 years, and continuous measurements over 14 months; (iv) a geophysical campaign with deep electrical resistivity tomography profiles acquired across the landslide mass. Our study shows that this 60 Mm3 landslide, which can be classified as a clay/silt compound landslide, moved by 15 m between 2001 and 2014 with a large inter-annual velocity variation (up to a factor of 500) depending on the rainfall intensity. We suggest that these dramatic changes in velocity are the result of the combination of a threshold mechanism and the short intense rainy season in Peru. This study reveals three main driving factors acting at different timescales: (i) over several decades, the river course has significantly changed, causing the Maca landslide reactivation in the 1980s due to the erosion of its toe; (ii) at the year scale, a minimum amount of rainfall is required to trigger the motion and this amount controls the landslide velocity; (iii) transient changes in slide velocity may occur anytime due to earthquakes. This study particularly highlights the non-linear behaviour of the motion with rainfall. Copyright © 2016 John Wiley & Sons, Ltd.
Published: 2016

32. Light induced nonlinear optical switch in boronated chromophores: A theoretical search towards high contrast switches in the azobenzene series

Author: Isabelle Malfant, Rosa Santillan, Cristina C. Jiménez, Norberto Farfán, Pascal G. Lacroix, Margarita Romero-Ávila, Facultad de Quimica, Universidad Nacional Autonoma de Mexico, ESIQIE, UPALM, Instituto Politécnico Nacional, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées
Subjects: Molecular switch, Ligand, Organic Chemistry, 02 engineering and technology, Crystal structure, Chromophore, 010402 general chemistry, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, Biochemistry, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Azobenzene, Materials Chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Density functional theory, Physical and Theoretical Chemistry, 0210 nano-technology, Isomerization, Boron trifluoride
Abstract: International audience; The possibility to obtain molecular nonlinear optical switches with high onloff contrast is discussed in boronated azobenzene derivatives from a computational investigation conducted at the Density Functional Theory (DFT) level. An optimized situation is found in the case of 2-(1-phenylazo-2-naphthol)1,3,2-benzodioxaborole in which the computed NLO response could decrease 8.5 times after E to Z isomerization. Herein is reported the synthesis and characterization of two new phenylazo derivatives prepared from the reaction of the corresponding ligand and boron trifluoride diethyl etherate, to test the synthetic feasibility of these boronated species. The crystal structure of 1-phenylazo-2-naphthalate difluoroborate is presented.
Published: 2015

33. Sparsity Optimization Method for Slow-Moving Landslides Detection in Satellite Image Time-Series

Author: Marie-Pierre Doin, Pascal G. Lacroix, Mai Quyen Pham, Institut des Sciences de la Terre (ISTerre), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA)
Subjects: 0211 other engineering and technologies, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Landslide, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], 02 engineering and technology, Synthetic data, Physics::Geophysics, symbols.namesake, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Gaussian noise, Norm (mathematics), Outlier, symbols, General Earth and Planetary Sciences, Satellite Image Time Series, [MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC], Electrical and Electronic Engineering, Time series, Image resolution, Algorithm, 021101 geological & geomatics engineering, Mathematics
Abstract: International audience; This paper presents a new method based on recent optimization technique to detect slow-moving landslides (
Published: 2018

34. Nitric oxide photo-release from a ruthenium nitrosyl complex with a 4,4′-bisfluorenyl-2,2′-bipyridine ligand

Author: Valerii Bukhanko, Norberto Farfán, Gabriel Ramos-Ortiz, Isabelle Malfant, Pascal G. Lacroix, Sonia Mallet-Ladeira, Alejandro Enriquez‐Cabrera, Rodrigo M. Barba-Barba, Isabelle Sasaki, Max Roose, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT-FR 2599), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Universidad Nacional Autónoma de México (UNAM), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, and Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)
Subjects: 010405 organic chemistry, Ligand, [SDV]Life Sciences [q-bio], chemistry.chemical_element, Quantum yield, Crystal structure, Fluorene, 010402 general chemistry, 01 natural sciences, 2,2'-Bipyridine, 0104 chemical sciences, Ruthenium, Inorganic Chemistry, chemistry.chemical_compound, Bipyridine, chemistry, Polymer chemistry, Materials Chemistry, [CHIM]Chemical Sciences, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, Terpyridine, ComputingMilieux_MISCELLANEOUS
Abstract: International audience; A ruthenium nitrosyl complex of formula [RuII(terpy)(F2B)(NO)](PF6)3, where terpy stands for 2,2′:6′,2″-terpyridine and F2B for 4,4′-bis(9,9′-dibutyl-9H-fluoren-2-yl)-2,2′-bipyridine, is presented and fully characterized. The X-ray crystal structure of F2B is reported. The electronic properties of the complex are compared to those of related [RuII(terpy)(bpy)(NO)]3+ complexes having a bipyridine (bpy) free of fluorene or bearing a fluorene on the terpyridine ligand. DFT computations are provided to support the experimental data. [RuII(terpy)(F2B)(NO)](PF6)3 releases NO under irradiation at 405 nm with a quantum yield (ϕNO) equal to 0.033. Additionally, the two-photon absorption cross-section investigated at 800 nm by the Z-scan technics is equal to 156 ± 23 GM, which indicates that the complex can release NO under irradiation in the therapeutic window.
Published: 2018

35. Comparison of carbazole and fluorene donating effects on the two-photon absorption and nitric oxide photo-release capabilities in a ruthenium-nitrosyl complex

Author: Isabelle Malfant, Norberto Farfán, Pascal G. Lacroix, Alejandro Enriquez‐Cabrera, Rodrigo M. Barba-Barba, Isabelle Sasaki, Gabriel Ramos-Ortiz, Sonia Mallet-Ladeira, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), and Universidad Nacional Autónoma de México (UNAM)
Subjects: Electronic structure, Tertiary amine, Photochemistry, [SDV]Life Sciences [q-bio], chemistry.chemical_element, Quantum yield, Crystal structure, Fluorene, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, Ruthenium, Inorganic Chemistry, chemistry.chemical_compound, Charge transfer, [CHIM]Chemical Sciences, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Ruthenium, Nitrogen oxides, Drug delivery, Density functional calculations, Photochemistry, Electronic structure, Charge transfer, 010405 organic chemistry, Carbazole, 0104 chemical sciences, Density functional calculations, chemistry, Drug delivery, Terpyridine, Derivative (chemistry), Nitrogen oxides
Abstract: International audience; A ruthenium–nitrosyl derivative of formula [RuII(CzT)(bipy)(NO)](PF6)3 [CzT = 4′-(N-ethylcarbazol-3-yl)-2,2′:6′,2′′-terpyridine, bipy = 2,2′-bipyridine] has been synthesized and fully characterized, and compared with the previously reported [RuII(FT)(bipy)(NO)](PF6)3 complex [FT = 4′-(9,9-dihexyl-9H-fluoren-2-yl)-2,2′:6′,2′′-terpyridine]. Additionally, the X-ray crystal structure of [RuII(CzT)(bipy)(NO2)](PF6), the precursor of [RuII(CzT)(bipy)(NO)](PF6)3, is reported. The presence of a tertiary amine in the carbazole unit leads to redshifted charge-transfer transitions towards the electron-withdrawing Ru–NO fragment and hence enhanced two-photon absorption (TPA) properties. In contrast, the quantum yield of the NO· photorelease process is lower for the carbazole-containing complex. The issue of optimization of the TPA versus NO·-release capabilities is addressed.
Published: 2018

36. Mechanism and oxidation state involved in the nitric oxide (NO) photorelease in a terpyridine-bipyridine-based ruthenium nitrosyl complex

Author: Pascal G. Lacroix, Valerii Bukhanko, Zoia Voitenko, Sonia Mallet-Ladeira, Marine Tassé, Isabelle Sasaki, Isabelle Malfant, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), National Taras Shevchenko University of Kiev, Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre [2016-2019] (ISTerre [2016-2019]), and Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])
Subjects: 010405 organic chemistry, Radical, [SDV]Life Sciences [q-bio], chemistry.chemical_element, Time-dependent density functional theory, 010402 general chemistry, Photochemistry, 01 natural sciences, 0104 chemical sciences, Ruthenium, law.invention, Inorganic Chemistry, chemistry.chemical_compound, Bipyridine, chemistry, Oxidation state, law, Materials Chemistry, [CHIM]Chemical Sciences, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, Terpyridine, Acetonitrile, Electron paramagnetic resonance, ComputingMilieux_MISCELLANEOUS
Abstract: International audience; A new nitric oxide (NO) donor of formula [RuII(MeO-Phtpy)(bpy)(NO)](PF6)3, where MeO-Phtpy is the 4′-(4-methoxyphenyl)-2,2′:6′,2″-terpyridine and bpy the 2,2′-bipyridine, has been synthesized and fully characterized. The X-ray crystal structure of the complex is provided together with that of its photoproduct of formula [RuII(MeO-Phtpy)(bpy)(MeCN)](NO3)2. The electronic properties have been investigated theoretically using the time dependent density functional theory (TD-DFT) approach. They reveal that the low-lying electronic transitions exhibit a strong charge transfer character towards the withdrawing nitrosyl unit, which suggest good NO donating capabilities under irradiation performed on a large frequency range. The photorelease of NO has been investigated in acetonitrile at two different wavelengths, λ = 365 and 436 nm, leading to related quantum yields equal to 0.08 and 0.03, respectively. The evolution of the oxidation states of the species involved within the release process is tracked by EPR and 1H NMR spectroscopy. It is confirmed that nitrosyl is released as NO radicals while the related ruthenium(III) photoproduct is readily reduced to ruthenium(II). The mechanism involved in the release is discussed on the basis of the present experimental data and the TD-DFT analysis.
Published: 2018

37. Use of Sentinel-2 images for the detection of precursory motions before landslide failures

Author: Denis Jongmans, Grégory Bièvre, Erwan Pathier, Pascal G. Lacroix, and Ulrich Kniess
Subjects: 010504 meteorology & atmospheric sciences, Cloud cover, 0211 other engineering and technologies, Soil Science, Precursors, Geology, Landslide, 02 engineering and technology, Geodesy, 01 natural sciences, Displacement (vector), Medium resolution, Acceleration, Lidar, Satellite, Satellite imagery, Computers in Earth Sciences, Sentinel-2, Scale (map), Landslides, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences, Remote sensing, Optical satellite
Abstract: The Sentinel-2 optical satellites provide a global coverage of land surfaces with a 5-day revisit time at the Equator. We investigate the ability of these freely available optical images to detect precursory motions before rapid landslides. A 9-month time-series of displacement is derived from Sentinel-2 data over a major landslide in the French Alps, which exhibited a sudden reactivation in June 2016. This analysis reveals a 7-month period of low activity (
Published: 2018

38. Earthquake-driven acceleration of slow-moving landslides in the Colca valley, Peru, detected from Pléiades images

Author: Edu Luis Taipe Maquerhua, Etienne Berthier, and Pascal G. Lacroix
Subjects: Acceleration, Landslide classification, Soil Science, Geology, Landslide, Satellite imagery, Shuttle Radar Topography Mission, Computers in Earth Sciences, Pleiades, Digital elevation model, Displacement (vector), Seismology
Abstract: Major earthquakes in mountainous areas often trigger rapid landslides. Some observations also suggest that earthquakes can damage landslide prone areas or cause slow-moving landslides to accelerate, with a risk of evolution to rapid landslides in the following months after the earthquake. Here, we use optical images from the Pleiades satellites to detect slow-moving landslides and quantify the effect of earthquakes on the landslide motion. We process multi-temporal Pleiades images acquired in March, April, and July 2013 over an area of 210 km2 in the Colca valley (South Peru), to obtain two Digital Elevation Models (DEM) and three displacement fields of the area. The processed DEMs have an uncertainty of 0.6 m (1σ), an order of magnitude better than two global and freely available DEMs (GDEM-v2 and SRTM), whereas the displacement fields have an uncertainty of between 0.11 and 0.18 m (1σ) in both horizontal directions. Using these data, we detect 9 slow-moving landslides and compare their velocities during the March–April and April–July periods. We find that landslide velocities are highest during the wet season, which suggests a strong groundwater control, and we also highlight a landslide acceleration caused by a regional Mw 6.0 earthquake. The major parameters controlling the acceleration of the slow-moving landslides are the rock type and the distance to the source, suggesting that friction at the basal interface in the weeks after the earthquake is dependent on the shaking intensity.
Published: 2015

39. Landslide monitoring in southern Peru: SEG Geoscientists Without Borders® project

Author: Pascal G. Lacroix, Edu Luis Taipe Maquerhua, Eric Larose, and Noélie Bontemps
Subjects: Passive imaging, 010504 meteorology & atmospheric sciences, Geomechanics, Landslide, 010502 geochemistry & geophysics, 01 natural sciences, Geology, Seismology, 0105 earth and related environmental sciences
Published: 2017

40. Replacing two chlorido ligands by a bipyridine ligand in ruthenium nitrosyl complexes with NO-release capabilities: A comparative study

Author: Norberto Farfán, Marine Tassé, Zoia Voitenko, Pascal G. Lacroix, Alejandro Enriquez‐Cabrera, Gabriel Ramos-Ortiz, Rodrigo M. Barba-Barba, Isabelle Malfant, Sonia Mallet-Ladeira, Isabelle Sasaki, Valerii Bukhanko, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Institut de Chimie de Toulouse (ICT-FR 2599), Centro de Investigaciones en Optica (CIO), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Facultad de Quimica, Universidad Nacional Autonoma de Mexico, National Taras Shevchenko University of Kiev, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)
Subjects: 010405 organic chemistry, Ligand, chemistry.chemical_element, Triclinic crystal system, 010402 general chemistry, Photochemistry, 01 natural sciences, Medicinal chemistry, Two-photon absorption, 0104 chemical sciences, Ruthenium, Inorganic Chemistry, Metal, Bipyridine, chemistry.chemical_compound, chemistry, visual_art, visual_art.visual_art_medium, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Solubility, Absorption (chemistry)
Abstract: International audience; Ru-II(FT)(bipy)(NO)][PF6](3) [FT is the electron-rich 4'-(2-fluorenyl)-2,2': 6',2 ''-terpyridine ligand and bipy is 2,2'-bipyridine] is synthesized and characterized. It crystallizes in the triclinic P (1) over bar space group [a = 9.5362(2) angstrom, b = 10.3946(4) angstrom, c = 22.5701(8) angstrom, alpha = 94.7400(10)degrees, beta = 94.9400(10)angstrom, gamma = 101.0680(10)]. A photochemical study is presented in comparison with that of the parents cis(Cl, Cl)-[RuII(FT) Cl-2(NO)][PF6] and trans(Cl, Cl)-[RuII(FT) Cl-2(NO)][PF6]. The three derivatives release nitric oxide ((NO)-N-center dot) under irradiation at lambda = 405 nm with respective quantum yields of 0.06, 0.31, and 0.10. Their two-photon absorption (TPA) cross-sections (sTPA) were investigated by the Z-scan technique on related derivatives in which two hexyl chains were introduced to improve their solubility while their spectroscopic properties remained almost unaffected. The resulting sTPA values of 100 GM at. = 800 nm are in the window of transparency for human tissues, and the bipyridine-based complex exhibits a slight tendency for higher efficiency. The replacement of the [Ru-II(Cl)(2)(NO)] core by [Ru-II(bipy)(NO)] provides a much simpler synthesis, and the TPA-induced (NO)-N-center dot-release capabilities are in the same range of magnitude. Therefore, it is envisioned that (NO)-N-center dot donors of greater complexity with several metal centers could be investigated in future.
Published: 2017

41. Integration of geotechnical and geophysical techniques for the characterization of a small earth-filled canal dyke and the localization of water leakage

Author: Guy Monnot, David Goutaland, Yannick Fargier, Pascal G. Lacroix, Grégory Bièvre, Laurent Oxarango, Institut des Sciences de la Terre (ISTerre), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut des Géosciences de l’Environnement (IGE), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Direction Centre-Est (Cerema Direction Centre-Est), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Direction Normandie-Centre (Cerema Direction Normandie-Centre), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), Laboratoire d'étude des transferts en hydrologie et environnement (LTHE), Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique de Grenoble (INPG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), and Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)
Subjects: 010504 meteorology & atmospheric sciences, EROSION, Water flow, Geophysical imaging, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], DIGUE, Geometry, Water head, 010502 geochemistry & geophysics, 01 natural sciences, INTERNAL EROSION, Internal erosion, LEAKAGE, FUITE, Geotechnical engineering, Electrical resistivity tomography, TOMOGRAPHIE, 0105 earth and related environmental sciences, geography, WATER HEAD, Hydrogeology, geography.geographical_feature_category, VIBRATION, GEOMETRY, Bedrock, Geophysics, GEOPHYSIQUE, Love wave, Earth-filled canal dyke, Levee, Leakage, EARTH-FILLED CANAL DYKE, Geology, Seismology
Abstract: This paper investigates the combined use of extensive geotechnical, hydrogeological and geophysical techniques to assess a small earth dyke with a permanent hydraulic head, namely a canal embankment. The experimental site was chosen because of known issues regarding internal erosion and piping phenomena. Two leakages were visually located following the emptying of the canal prior to remediation works. The results showed a good agreement between the geophysical imaging techniques (Electrical Resistivity Tomography, P- and SH-waves Tomography) and the geotechnical data to detect the depth to the bedrock and its lateral variations. It appeared that surface waves might not be fully adapted for dyke investigation because of the particular geometry of the studied dyke, non-respectful of the 1D assumption, and which induced depth and velocity discrepancies retrieved from Rayleigh and Love waves inversion. The use of these classical prospecting techniques however did not allow to directly locate the two leakages within the studied earth dyke. The analysis of ambient vibration time series with a modified beam-forming algorithm allowed to localize the most energetic water flow prior to remediation works. It was not possible to detect the leakage after remediation works, suggesting that they efficiently contributed to significantly reduce the water flow. The second leakage was not detected probably because of a non-turbulent water flow, generating few energetic vibrations.
Published: 2017

42. Photorelease of nitric oxide (NO) on ruthenium nitrosyl complexes with phenyl substituted terpyridines

Author: Joëlle Akl, Véronique Pimienta, Isabelle Malfant, Sonia Mallet-Ladeira, Silvia Amabilino, Pascal G. Lacroix, Marine Tassé, Isabelle Sasaki, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), IDeAS - Interfaces Dynamiques et Assemblages Stimulables (IDeAS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées, Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP)
Subjects: 010405 organic chemistry, Substituent, chemistry.chemical_element, General Chemistry, 010402 general chemistry, Ring (chemistry), Photochemistry, 01 natural sciences, Medicinal chemistry, Catalysis, 0104 chemical sciences, Ruthenium, Metal, chemistry.chemical_compound, chemistry, visual_art, Potential energy surface, Pyridine, Materials Chemistry, visual_art.visual_art_medium, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Terpyridine, Visible spectrum
Abstract: International audience; We investigated the influence of the nature of the substituent on the 4′-position of terpyridine ligands and the geometry around the metal ion on the photosensitization of ruthenium nitrosyl complexes. This was achieved by synthesizing a series of [Ru(R-Phtpy)Cl2(NO)]+ complexes based on tridentate terpyridine ligands with a substituted phenyl ring on the central pyridine (R = NO2, H, Br, OMe). The properties of both cis-(Cl,Cl)[Ru(R-Phtpy)Cl2(NO)]+ and trans-(Cl,Cl)[Ru(R-Phtpy)Cl2(NO)]+ isomers are presented. The optimized geometries and UV-Vis spectra were fully computed by DFT calculations and are in agreement with the experimental data. Quantum yields of NO release were obtained by numerical modeling and parameter optimization on the time evolution of the electronic spectra during irradiation. On irradiation with visible light in MeCN both cis(Cl,Cl)- and trans(Cl,Cl)-[Ru(MeO-Phtpy)Cl2(NO)](PF6) undergo facile photorelease of NO with the concomitant formation of the photoproduct as the solvate. Unambiguous characterization of the photoproduct for R = OMe was achieved by X-ray analysis and revealed that both isomers lead to trans(Cl,Cl)-[Ru(MeO-Phtpy)Cl2(MeCN)](PF6) as the unique photoproduct. The calculation of the relaxed potential energy surface confirmed an internal rearrangement of the cis(Cl,Cl) isomer to the trans(Cl,Cl) one after NO release.
Published: 2017

43. Coseismic and postseismic motion of a landslide: Observations, modeling, and analogy with tectonic faults

Author: Pascal G. Lacroix, Bertrand Guillier, Hugo Perfettini, and Edu Taipe
Subjects: Triggering, Earthquake, Terremotos, Landslide classification, Movimientos en masa, Landslide, Active fault, Slip (materials science), Rate and state friction, Tectónica, Tectonics, Geophysics, Coeficiente de fricción, General Earth and Planetary Sciences, Deslizamientos, Modelos tectónicos, Geology, Seismology
Abstract: We document the first time series of a landslide reactivation by an earthquake using continuous GPS measurements over the Maca landslide (Peru). Our survey shows a coseismic response of the landslide of about 2 cm, followed by a relaxation period of 5 weeks during which postseismic slip is 3 times greater than the coseismic displacement itself. Our results confirm the coseismic activation of landslides and provide the first observation of a postseismic displacement. These observations are consistent with a mechanical model where slip on the landslide basal interface is governed by rate and state friction, analogous to the mechanics of creeping tectonic faults, opening new perspectives to study the mechanics of landslides and active faults.
Published: 2014

44. Supervised Method of Landslide Inventory Using Panchromatic SPOT5 Images and Application to the Earthquake-Triggered Landslides of Pisco (Peru, 2007, Mw8.0)

Author: Laurence Audin, Etienne Berthier, Pascal G. Lacroix, Bilberto Zavala, Institut des Sciences de la Terre (ISTerre), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), INGEMMET, Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Instituto Geológico Minero y Metalúrgico (INGEMMET), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)
Subjects: 010504 meteorology & atmospheric sciences, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Soil cover, [SDE.MCG]Environmental Sciences/Global Changes, SATELLITE SPOT, IMAGE SATELLITE, detection, optical imagery, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], 010502 geochemistry & geophysics, 01 natural sciences, GLISSEMENT DE TERRAIN, topography, Peru, Satellite imagery, TELEDETECTION, lcsh:Science, Deslizamientos, Forearc, 0105 earth and related environmental sciences, Remote sensing, Inventario, landslides, Pixel, Orientation (computer vision), Terremotos, Imágenes de satélite, Orthophoto, VALIDATION DE RESULTAT, ETUDE REGIONALE, Landslide, TOPOGRAPHIE, Panchromatic film, SPOT5, triggering, power-law, 13. Climate action, inventories, earthquake, General Earth and Planetary Sciences, SISMOLOGIE, lcsh:Q, Sensores remotos, Geology, METHODOLOGIE
Abstract: International audience; Earthquake is one of the dominant triggering factors of landslides. Given the wide areas covered by mega earthquake-triggered landslides, their inventory requires development of automatic or semi-automatic methods applied to satellite imagery. A detection method is here proposed for this purpose, to fit with simple datasets; SPOT5 panchromatic images of 5 m resolution coupled with a freely and globally available DEM. The method takes advantage of multi-temporal images to detect changes based on radiometric variations after precise coregistration/orthorectification. Removal of false alarms is then undertaken using shape, orientation and radiometric properties of connected pixels defining objects. 80% of the landslides and 93% of the landslide area are detected indicating small omission errors but 50% of false alarms remain. They are removed using expert based analysis of the inventory. The method is applied to realize the first comprehensive inventory of landslides triggered by the Pisco earthquake (Peru, 15/08/2007, Mw 8.0) over an area of 27,000 km2. 866 landslides larger than 100 m2 are detected covering a total area of 1.29 km2. The area/number distribution follows a power-law with an exponent of 1.63, showing a very particular regime of triggering in this arid environment compared to other areas in the world. This specific triggering can be explained by the little soil cover in the coastal and forearc regions of Peru. Analysis of this database finally shows a major control of the topography (both orientation and inclination) on the repartition of the Pisco-triggered landslides.
Published: 2013

45. trans- and cis-(Cl,Cl)-[Ru

Author: Joelle, Akl, Isabelle, Sasaki, Pascal G, Lacroix, Vincent, Hugues, Patricia, Vicendo, Mathilde, Bocé, Sonia, Mallet-Ladeira, Mireille, Blanchard-Desce, and Isabelle, Malfant
Subjects: Infrared Rays, Antineoplastic Agents, Phototherapy, Nitric Oxide
Abstract: cis- and trans-(Cl,Cl)-[Ru
Published: 2016

46. MULTI-PROPERTY MATERIALS - MAGNETISM AND NLO PROPERTIES

Author: René Cléement, Dermot O'Hare, John S. O. Evans, and Pascal G. Lacroix
Subjects: Property (philosophy), Materials science, Mechanics of Materials, Magnetism, Mechanical Engineering, Mineralogy, Nonlinear optics, General Materials Science, Nanotechnology
Published: 2016

47. Synthesis, crystal structure, spectroscopic, and photoreactive properties of a ruthenium(II)-mononitrosyl complex

Author: Marine Tassé, Pascal G. Lacroix, Hasan Shamran Mohammed, Isabelle Malfant, Chloé Sabourdy, Sonia Mallet-Ladeira, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées
Subjects: Molecular switch, education.field_of_study, 010405 organic chemistry, Ligand, Stereochemistry, Population, chemistry.chemical_element, Crystal structure, Triclinic crystal system, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Ruthenium, Inorganic Chemistry, chemistry.chemical_compound, Crystallography, chemistry, Materials Chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, Ground state, education, Derivative (chemistry)
Abstract: A compound of formula [RuIICl(NO)(Cl-py)4](PF6)2, in which Cl-py is the 4-chloropyridine, has been synthesized in four steps and fully characterized. It crystallizes in the P 1 ¯ triclinic space group as [RuIICl(NO)(Cl-py)4](PF6)2·1.25H2O. Upon irradiation at λ = 473 nm in the solid state, the N-bounded nitrosyl ligand (ground state GS: [RuII(NO)]) turns into O-bounded nitrosyl metastable state 1 (MS1: [RuII(ON)]). The population of the long-lived metastable RuII(ON) isomer is equal to 27% on powder samples, therefore 3 times less than that of the parent [RuIICl(NO)(py)4](PF6)2 derivative. Spectroscopy and TD-DFT studies are proposed to find a rational for this difference at the molecular level, which is tentatively related to different UV–visible spectra in the metastable RuII(ON) isomer. Surprisingly, and while the switching efficiency of [RuIICl(NO)(Cl-py)4](PF6)2 appears relatively modest, its capability for releasing the biologically active nitric oxide (NO ) radical under irradiation in solution is find to be about 100 times that of the [RuIICl(NO)(py)4](PF6)2 derivative.
Published: 2016

48. Second-order nonlinear optics in coordination chemistry: An open door towards multi-functional materials and molecular switches

Author: Isabelle Malfant, Christine Lepetit, Pascal G. Lacroix, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées
Subjects: chemistry.chemical_classification, Molecular switch, Nonlinear optics, 02 engineering and technology, Chromophore, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Square (algebra), 0104 chemical sciences, Coordination complex, Inorganic Chemistry, Quadratic equation, chemistry, Chemical physics, Computational chemistry, Materials Chemistry, Density functional theory, ZINDO, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, 0210 nano-technology
Abstract: International audience; Various inorganic and organometallic complexes exhibiting quadratic nonlinear optical (NLO) properties (i.e., linearly correlated to the square of the electric field E2) are reviewed. The computational approaches available for the calculation at various levels (either semi-empirical (ZINDO) or density functional theory (DFT)), and analysis of the NLO response are recalled. Metal-containing species usually offer architectures and NLO responses of greater versatility than those of the well-known “push-pull” organic chromophores. Their additional (e.g., magnetic) electronic abilities, open up access to multi-property molecular materials, an intriguing class of materials, which are presented and discussed here, in a perspective of molecular switch.
Published: 2016

49. Isoindole and isomeric heterocyclic donating substituents in ruthenium(II)nitrosyl complexes with large first hyperpolarizabilities and potential two-photon absorption capabilities: a computational approach

Author: Zoia Voitenko, Pascal G. Lacroix, Valerii Bukhanko, Isabelle Malfant, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Department of Chemistry, Taras Shevchenko National University of Kyiv, Taras Shevchenko National University of Kyiv, Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées
Subjects: 010405 organic chemistry, Carbazole, Substituent, chemistry.chemical_element, Fluorene, 010402 general chemistry, Photochemistry, 01 natural sciences, Two-photon absorption, 0104 chemical sciences, Ruthenium, chemistry.chemical_compound, chemistry, Computational chemistry, Density functional theory, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Terpyridine, Isoindole
Abstract: International audience; A set of 22 ruthenium nitrosyl complexes of general formula [RuII(L)Cl2(NO)]+ is investigated computationally by the density functional theory. L is a terpyridine ligand substituted by different R isomers of formula C12H8N, either indole, isoindole, or carbazole, proposed as alternative donors to the electron-rich fluorene substituent. The computed resulting nonlinear optical (NLO) properties are found to strongly depend on the isomer. While the ruthenium complexes exhibit modest efficiencies at the second-order (two-photon absorption) level, some of the R isomers lead to complexes of enhanced capabilities in first order (b) nonlinear optics. The synthetic feasibility of these ligands is discussed.
Published: 2016

50. trans- and cis-(Cl,Cl)-[RuII(FT)Cl2(NO)](PF6): promising candidates for NO release in the NIR region

Author: Mireille Blanchard-Desce, Isabelle Malfant, Sonia Mallet-Ladeira, Isabelle Sasaki, Pascal G. Lacroix, Mathilde Bocé, Patricia Vicendo, Joëlle Akl, Vincent Hugues, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Institut des Sciences Moléculaires (ISM), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Université Sciences et Technologies - Bordeaux 1-Université Montesquieu - Bordeaux 4-Institut de Chimie du CNRS (INC), Interactions moléculaires et réactivité chimique et photochimique (IMRCP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Institut de pharmacologie et de biologie structurale (IPBS), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT), Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1 (UB)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Fédération de Recherche Fluides, Energie, Réacteurs, Matériaux et Transferts (FERMAT), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), IDeAS - Interfaces Dynamiques et Assemblages Stimulables (IDeAS), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 010405 organic chemistry, Stereochemistry, Chemistry, 010402 general chemistry, Photochemistry, Nitric oxide metabolism, 01 natural sciences, 0104 chemical sciences, 3. Good health, Resection, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, Phototoxicity, Cytotoxicity, No release
Abstract: International audience; cis- and trans-(Cl,Cl)-[RuII(FT)Cl2(NO)](PF6) complexes show efficient NO photodelivery upon two-photon excitation in the NIR region. Moreover, cytotoxicity and phototoxicity studies provide evidence that these complexes are promising candidates as photoactivatable molecular tools for resection of malignancies.
Published: 2016

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