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16 results on '"Bruno Baguenard"'

1. Theoretical and experimental analysis of circularly polarized luminescence spectrophotometers for artifact-free measurements using a single CCD camera

Author

Bruno Baguenard, Amina Bensalah-Ledoux, Laure Guy, François Riobé, Olivier Maury, and Stéphan Guy

Subjects
Science
Abstract

The authors present an artifact-free circularly polarized luminescence spectrophotometer using a single camera and two polarization encoding paths. The spectra are measured in a few seconds without the need of calibration by inverting the role of the paths.

Published
2023
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2. Acid/Base-Triggered Photophysical and Chiroptical Switching in a Series of Helicenoid Compounds

Author

Laure Guy, Maëlle Mosser, Delphine Pitrat, Jean-Christophe Mulatier, Mercedes Kukułka, Monika Srebro-Hooper, Erwann Jeanneau, Amina Bensalah-Ledoux, Bruno Baguenard, and Stéphan Guy

Subjects
dibenzo[c]acridine derivatives, chiroptical properties, ECD, CPL, acid/base equilibrium, (TD)DFT, Organic chemistry, QD241-441
Abstract

A series of molecules that possess two quinolines, benzoquinolines, or phenanthrolines connected in a chiral fashion by a biaryl junction along with their water-soluble derivatives was developed and characterized. The influence of the structure on the basicity of the nitrogen atoms in two heterocycles was examined and the photophysical and chiroptical switching activity of the compounds upon protonation was studied both experimentally and computationally. The results demonstrated that changes in the electronic structure of the protonated vs. neutral species, promoting a bathochromic shift of dominant electronic transitions and alternation of their character from π-to-π* to charge-transfer-type, when additionally accompanied by the high structural flexibility of a system, leading to changes in conformational preferences upon proton binding, produce particularly pronounced modifications of the spectral properties in acidic medium. The latter combined with reversibility of the read-out make some of the molecules in this series very promising multifunctional pH probes.

Published
2023
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3. Elliptical Birefringent Rib‐Channel Chirowaveguides for Quasicircularly Polarized Light Applications in Integrated Photonics

Author

Hoshang Sahib, Alban Gassenq, Amina Bensalah-Ledoux, Bruno Baguenard, Laure Guy, and Stephan Guy

Subjects
chiralities, chirowaveguides, photonics, polarization, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

Polarization in photonic‐integrated circuits (PICs) is governed by transverse electric (TE) and magnetic (TM) polarizations due to the planar structure of the chips. Therefore, all states of polarization (SOPs) other than TE and TM, in particular circular polarization, cannot be routed without modification across the chips. Herein, the realization of rib‐channel chirowaveguides supporting elliptically polarized guided modes by combining linear and circular birefringences as predicted by the coupled mode approach is shown. The sol–gel process and the imprint technique to make channel chirowaveguides with different sizes and consequently modulate ellipticity of the eigenmodes from linear to quasicircular are used. Circularly polarized light propagates therefore with a low polarization beating and in particular without handedness inversion. These results open the field of application of PICs to all domains where circularly polarized light is relevant.

Published
2022
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4. Circularly polarized activity from two photon excitable europium and samarium chiral bioprobes

Author

Silvia Mizzoni, Silvia Ruggieri, Annika Sickinger, François Riobé, Laure Guy, Margaux Roux, Guillaume Micouin, Akos Banyasz, Olivier Maury, Bruno Baguenard, Amina Bensalah-Ledoux, Stéphan Guy, Alexei Grichine, Xuan-Nhi Nguyen, Andrea Cimarelli, Martina Sanadar, Andrea Melchior, and Fabio Piccinelli

Subjects
lanthanide ions, two photon absorption, optical probe, Materials Chemistry, circularly polarized luminescence, General Chemistry
Abstract

Circularly polarized luminescence activity from new cationic water soluble Sm(iii) and Eu(iii) complexes is triggered by one- and two-photon absorption processes. The Eu(iii) complex is shown to be an efficient NIR-to-RED probe in cellulo.

Published
2023
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5. Circularly polarized luminescence in the one-dimensional assembly of binaphtyl-based Yb( iii ) single-molecule magnets

Author

Carlo Andrea Mattei, Vincent Montigaud, Bertrand Lefeuvre, Vincent Dorcet, Gilles Argouarch, Olivier Cador, Boris Le Guennic, Olivier Maury, Claudia Lalli, Yannick Guyot, Stéphan Guy, Cyprien Gindre, Amina Bensalah-Ledoux, François Riobé, Bruno Baguenard, Fabrice Pointillart, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), This work was supported by CNRS, Université de Rennes, the European Research Council through the ERC-CoG 725184 MULTIPROSMM (project no. 725184) and the Agence Nationale de la Recherche (SMMCPL ANR-19-CE29-0012-02)., ANR-19-CE29-0012,SMMCPL,Luminescence polarisée circulairement de molécules-aimants à base de lanthanide(2019), and European Project: 725184,H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC),MULTIPROSMM(2017)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Materials Chemistry, [CHIM.COOR]Chemical Sciences/Coordination chemistry, General Chemistry
Abstract

Lanthanide ions have attracted great interest owing to their optical and magnetic properties. Single-molecule magnet (SMM) behavior has been a fascinating science for thirty years. Moreover, chiral lanthanide complexes allow the observation of remarkable circularly polarized luminescence (CPL). However, the combination of both SMM and CPL behaviors in a single molecular system is very rare and deserves attention in the design of multifunctional materials. Four chiral one-dimensional coordination compounds involving 1,1′-Bi-2-naphtol (BINOL)-derived bisphosphate ligands and the Yb(III) centre were synthesized and characterized by powder and single-crystal X-ray diffraction. All the Yb(III)-based polymers displayed field-induced SMM behavior with magnetic relaxation occurring by applying Raman processes and near infrared CPL in the solid state.

Published
2023
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6. Multifunctional Helicene‐Based Ytterbium Coordination Polymer Displaying Circularly Polarized Luminescence, Slow Magnetic Relaxation and Room Temperature Magneto‐Chiral Dichroism**

Author

Kais Dhbaibi, Maxime Grasser, Haiet Douib, Vincent Dorcet, Olivier Cador, Nicolas Vanthuyne, François Riobé, Olivier Maury, Stéphan Guy, Amina Bensalah‐Ledoux, Bruno Baguenard, Geert L. J. A. Rikken, Cyrille Train, Boris Le Guennic, Matteo Atzori, Fabrice Pointillart, Jeanne Crassous, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Larbi Tébessi [Tebessa], Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), The French National Research Agency (ANR) and the European Research Council (ERC) are acknowledged for financial support through SMMCPL (ANR-19-CE29-0012-02) and the European Union's Horizon 2020 research and innovation program (ERC-CoG MULTIPROSMM, Grant Agreement No. 725184). MG and BLG thank the French Agreement GENCI/IDRIS-CINES centers for high-performance computing resources., ANR-19-CE29-0012,SMMCPL,Luminescence polarisée circulairement de molécules-aimants à base de lanthanide(2019), and European Project: 725184,H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC),MULTIPROSMM(2017)

Subjects
Single-molecule Magnet, [CHIM]Chemical Sciences, circularly polarized luminescence, ytterbium, General Medicine, General Chemistry, helicene, Catalysis, Magnetochiral Effect
Abstract

International audience; The combination of physical properties sensitive to molecular chirality in a single system allows the observation of fascinating phenomena such as Magneto-Chiral Dichroism (MChD) and Circularly Polarized Luminescence (CPL) having potential applications for optical data readout and display technology. Homochiral monodimensional coordination polymers of YbIII were designed from a 2,15-bis-ethynyl-hexahelicenic scaffold decorated with two terminal 4-pyridyl units. Thanks to the coordination of the chiral organic chromophore to Yb(hfac)3 units, efficient NIR-CPL activity is observed. Moreover, the specific crystal field around the YbIII induces a strong magnetic anisotropy which leads to a slow magnetic relaxation (SMM) and a remarkable room temperature MChD. The MChD-structural correlation is supported by computational investigations.

Published
2022
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7. Surface chemistry of perovskite nanoplatelets exhibiting circularly polarized luminescence

Author

Austin Hubley, Amina Bensalah-Ledoux, Bruno Baguenard, Stephan Guy, Benjamin Abécassis, and Benoit Mahler

Abstract

Chiral halide perovskite nanocrystals have many applications in next-generation optoelectronic devices due to their interaction with circularly polarized light. Through the careful selection of chiral organic surface ligands, control over the circular dichroism (CD) and circularly polarized luminescence (CPL) of these materials can be achieved. However, while recent developments of CD-active perovskites have seen significant advances, effective CPL remains a challenge. Here, we synthesize colloidal perovskite nanoplatelets exhibiting room temperature CPL with dissymmetry factors up to glum=4.3×10^(-3) and gabs=8.4×10^(-3). Methylammonium lead bromide nanoplatelets are synthesized with a mixture of chiral dimethyl benzyl ammonium ligands and achiral octylammonium ligands, the precise ratio of which is shown to be critical to achieving high g-factors. We investigate the competitive binding of these surface ligands using 1H NMR, and use an equilibrium model to demonstrate the ligand affinity. The magnitude of CPL and CD is quantitatively shown to exhibit a linear correlation, such that glum=0.4×gabs. Lastly, by screening several amines with close structures, we show that subtle differences in ligand structure have significant impact on the resulting CD signal of the nanoplatelets. Our findings provide new insights for the effective design of perovskites exhibiting CPL and can facilitate the development of high-performance devices based on circularly polarized luminescence.

Published
2022
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8. Chiral Benzothiazole Monofluoroborate Featuring Chiroptical and Oxygen-Sensitizing Properties: Synthesis and Photophysical Studies

Author

Bruno Baguenard, Stephan Guy, Olivier Maury, Frédéric Gendron, David M. Perrin, Emmanuel Gras, Amina Bensalah-Ledoux, Omar Sadek, Laura Abad Galán, Boris Le Guennic, 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), Laboratoire de Chimie - UMR5182 (LC), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Matériaux et nanostructures photoniques (MNP), Institut Lumière Matière [Villeurbanne] (ILM), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, University of British Columbia (UBC), O.S. acknowledges support from Université Toulouse III and the French-Canadian Research Fund (FCRF). B.B., S.G., A.B.-L., B.L.G., O.M., L.A.G., O.S., and E.G. acknowledge support from Agence Nationale de la Recherche (ANR-18-CE07-0016/ANR-19-CE29-0012-02). F.G. and B.L.G. acknowledge support from the European Research Council (ERC-CoG MULTIPROSMM, Grant Agreement 7255184). F.G. thanks the Région Bretagne for its support (SAD 18006-LnCPLSMM). F.G. and B.L.G. thank the French GENCI/IDRIS-CINES centers for high-performance computing resources (allocations A0020800649 and A0040800649)., ANR-18-CE07-0016,CatSAmy,CatalyseurS à base d'agrégats Amyloïdes.(2018), ANR-19-CE29-0012,SMMCPL,Luminescence polarisée circulairement de molécules-aimants à base de lanthanide(2019), European Project: 725184,H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC),MULTIPROSMM(2017), 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), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
inorganic chemicals, medicine.medical_treatment, Photodynamic therapy, 010402 general chemistry, Ligands, 01 natural sciences, Stereocenter, Absorption, Physical Phenomena, chemistry.chemical_compound, medicine, Molecule, [CHIM]Chemical Sciences, Singlet state, Benzothiazoles, Boron, 010405 organic chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Organic Chemistry, Absolute configuration, Stereoisomerism, Combinatorial chemistry, Chiral resolution, 3. Good health, 0104 chemical sciences, Oxygen, Benzothiazole, chemistry, Mixtures, Enantiomer, Molecular structure
Abstract

International audience; Advances in personalized medicine are prompting the development of multimodal agents, that is, molecules that combine properties promoting various diagnostic and therapeutic applications. General approaches exploit chemical conjugation of therapeutic agents with contrast agents or the design of multimodal nanoplatforms. Herein, we report the design of a single molecule that exhibits potential for different diagnostic modes as well as the ability to sensitize oxygen, thus offering potential for photodynamic therapy. Exceptionally, this work involves the synthesis and chiral resolution of an enantiomeric pair of chiral monofluoroborates that contain a stereogenic boron atom. Combining experimental and theoretical chiroptical studies allowed the unambiguous determination of their absolute configuration. Photophysical investigations established the ability of this compound to sensitize oxygen even in the absence of heavy atoms within its structure. The synthesis of a chiral benzothiazole monofluoroborate paves a way to multimodal diagnostic tools (fluorescence and nuclear imaging) while also featuring potential therapeutic applications owing to its ability to activate oxygen to its singlet state for use in photodynamic therapy.

Published
2021
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9. Solid-State Near-Infrared Circularly Polarized Luminescence from Chiral YbIII-Single-Molecule Magnet

Author

Stephan Guy, Frédéric Gendron, Bruno Baguenard, Fabrice Pointillart, Vincent Dorcet, Olivier Maury, Claudia Lalli, Bertrand Lefeuvre, Amina Bensalah-Ledoux, Jessica Flores Gonzalez, Olivier Cador, Carlo Andrea Mattei, François Riobé, Boris Le Guennic, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de l'ENS Lyon (Phys-ENS), École normale supérieure de Lyon (ENS de Lyon)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Matériaux et nanostructures photoniques (MNP), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), 725184, European Commission, SMMCPL ANR-19-CE29-0012-02, Agence Nationale de la Recherche, ANR-19-CE29-0012,SMMCPL,Luminescence polarisée circulairement de molécules-aimants à base de lanthanide(2019), European Project: 725184,H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC),MULTIPROSMM(2017), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), École normale supérieure - Lyon (ENS Lyon)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC)

Subjects
Ytterbium, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, Catalysis, Ion, chemistry.chemical_compound, medicine, Single Molecule Magnet, [CHIM]Chemical Sciences, Single-molecule magnet, triad, 010405 organic chemistry, Organic Chemistry, Near-infrared spectroscopy, Triad (anatomy), circularly polarized luminescence, ytterbium, General Chemistry, 0104 chemical sciences, Crystallography, medicine.anatomical_structure, chemistry, Magnet, chiral ancillary ligand, Luminescence, Tetrathiafulvalene
Abstract

International audience; A field-induced chiral Yb III Single-Molecule Magnet (SMM) displayed an unprecedented near-infrared circularly polarized luminescence (NIR-CPL) in solid-state. The bridging bis(1,10-phenantro[5,6b])tetrathiafulvalene triad ( L ) allowed an efficient sensitization of the NIR 2 F 5/2 → 2 F 7/2 emission while the NIR-CPL is associated to the f-f transitions of the Yb III ion bearing chiral β-diketonate derived-camphorate ancillary ligands.

Published
2021
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11. Solid-State Near-Infrared Circularly Polarized Luminescence from Chiral Yb

Author

Bertrand, Lefeuvre, Carlo Andrea, Mattei, Jessica Flores, Gonzalez, Frédéric, Gendron, Vincent, Dorcet, François, Riobé, Claudia, Lalli, Boris, Le Guennic, Olivier, Cador, Olivier, Maury, Stéphan, Guy, Amina, Bensalah-Ledoux, Bruno, Baguenard, and Fabrice, Pointillart

Abstract

A field-induced chiral Yb

Published
2021

12. Luminescence, chiroptical, magnetic and ab initio crystal-field characterizations of an enantiopure helicoidal Yb( iii ) complex

Author

Stephan Guy, Amina Bensalah-Ledoux, Francesco Zinna, Guillaume Pilet, Laure Guy, Lorenzo Di Bari, Sebastiano Di Pietro, François Riobé, Olivier Cador, Olivier Maury, Boris Le Guennic, Yannick Guyot, Virginie Placide, Bruno Baguenard, Fabrice Pointillart, Laura Abad Galán, Frédéric Gendron, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), University of Pisa - Università di Pisa, Matériaux et nanostructures photoniques (MNP), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Luminescence (LUMINESCENCE), Laboratoire des Multimatériaux et Interfaces (LMI), F.G and B.L.G thank the French GENCI/IDRIS‐CINES center for high‐performance computing resources. F.G. andB.L.G. acknowledge the Stratégie d’Attractivité Durable (SAD18006—LnCPLSMM). Authors acknowledge supportfrom Agence Nationale de la Recherche (SMMCPL ANR-19-CE29-0012-02) and the European Research Councilunder the European Union’s Horizon 2020 research and innovation program (ERC-CoG MULTIPROSMM, Grantagreement No. 725184). All authors are indebted to J.-H. van Vleck for illuminating the richness and complexity oflanthanide optical spectra., ANR-19-CE29-0012,SMMCPL,Luminescence polarisée circulairement de molécules-aimants à base de lanthanide(2019), European Project: 725184,H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC),MULTIPROSMM(2017), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), and Université de Lyon-Université de Lyon

Subjects
Materials science, Field (physics), 010405 organic chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Ab initio, Electronic structure, 010402 general chemistry, 01 natural sciences, Molecular physics, Spectral line, 0104 chemical sciences, Inorganic Chemistry, Crystal, Ab initio quantum chemistry methods, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Wave function, Luminescence
Abstract

International audience; The electronic structure of a chiral Yb(III)-based complex is fully determined by taking advantage of experimental magnetic, luminescence, and chiroptical (NIR-ECD and CPL) characterizations in combination with ab initio wavefunction calculations. The combined use of these techniques allows determining with high resolution the electronic structure diagram as well as the nature of the different states involved in the magnetic and chiroptical properties of the investigated complex. The crystal-field picture deduced from spectroscopic measurements (absorption and emission) is used to reproduce the magnetic properties. Subsequently, advanced ab initio calculations demonstrate that global chiroptical spectra correspond to the sum of entangled transitions with similar or opposite polarizations.

Published
2021
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13. Reversible Soft Mechanochemical Control of Biaryl Conformations through Crosslinking in a 3D Macromolecular Network

Author

Bruno Baguenard, Alain Chaumont, Sarah Zahouani, Stephan Guy, Julien Kelber, Pierre Schaaf, Loïc Jierry, Amina Bensalah-Ledoux, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace, Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Université de Strasbourg (UNISTRA)-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))-Université de Strasbourg (UNISTRA), Matériaux et nanostructures photoniques (MNP), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Univ Strasbourg, INSERM, UMR S 1121, F-67085 Strasbourg, France, Faculté de chirurgie dentaire - Strasbourg, Université de Strasbourg (UNISTRA), Chimie de la matière complexe (CMC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), ANR-15-CE29-0015,MECHANOCAT,Des surfaces mécanocatalytiques : contrôler la catalyse par une force mécanique(2015), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-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)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-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)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Biomatériaux et Bioingénierie (BB), Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-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), Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), SCHAAF, Pierre, Université de Strasbourg (UNISTRA)-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)-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, 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), Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Matériaux et Nanosciences Grand-Est (MNGE), and 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)-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)

Subjects
conformation, Circular dichroism, Materials science, chirality, Dihedral angle, Elastomer, 010402 general chemistry, 01 natural sciences, Catalysis, [SPI]Engineering Sciences [physics], Mechanochemistry, [CHIM] Chemical Sciences, Moiety, [CHIM]Chemical Sciences, stimulus-responsive materials, [PHYS]Physics [physics], 010405 organic chemistry, General Chemistry, General Medicine, 0104 chemical sciences, circular dichroism, Crystallography, [CHIM.OTHE] Chemical Sciences/Other, Covalent bond, Chimie/Autre, mechanochemistry, Chirality (chemistry), [CHIM.OTHE]Chemical Sciences/Other, Macromolecule
Abstract

International audience; Tuning the dihedral angle (DA) of axially chiral compounds can impact biological activity, catalyst efficiency, molecular motor performance, or chiroptical properties. Herein, we report gradual, controlled and reversible changes in molecular conformation of a covalently linked binaphthyl moiety, within a 3D polymeric network by the application of a macroscopic stretching force. We managed a direct observation of the DA changes by measuring the circular dichroism signal of an optically pure BINOL-crosslinked elastomer network. In accordance with computed spectra, stretching the elastomer resulted in a widening of the DA between naphthyl rings when the BINOL was doubly-grafted to the elastomer network, while no effect was observed when a single naphthyl ring of the BINOL was grafted to the elastomer network. Combining both experimental and theoretical results, we have determined that ~170% extension of the elastomers led to the transfer of a mechanical force to the BINOL moiety of 2.5 kcal*mol-1 *Å-1 (~175 pN) in magnitude and results in the opening of the DA of BINOL up to ~130°.

Published
2020
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14. Modulation of Chiroptical Properties in a Series of Helicene-like Compounds

Author

Erwann Jeanneau, Monika Srebro-Hooper, Bruno Baguenard, Stephan Guy, Maëlle Mosser, Amina Bensalah-Ledoux, Delphine Pitrat, Laure Guy, Mercedes Kukułka, Jean-Christophe Mulatier, Laboratoire de Chimie - UMR5182 (LC), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), Jagiellonian Univ, Fac Chem, Faculty of Chemistry - Jagiellonian University, Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ)-Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Laboratoire des Multimatériaux et Interfaces (LMI), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre de diffractométrie Henri Longchambon, Institut de Chimie de Lyon, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Matériaux et nanostructures photoniques (MNP), Institut Lumière Matière [Villeurbanne] (ILM), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), and ANR-18-CE06-0010,CAPTOR,Capteur Photoniques Chiraux(2018)

Subjects
Aromatic compounds, Series (mathematics), 010405 organic chemistry, Stereochemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Organic Chemistry, Circular dichroism spectroscopy, Reaction products, Molecules, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Fragment (logic), Helicene, Modulation, Acridine, [CHIM.CRIS]Chemical Sciences/Cristallography, Molecular structure
Abstract

International audience; We describe a large-scale synthesis of a series of helicene-like compounds based on a dibenzo[c]acridine fragment by the Friedlander reaction. The series includes targeted constrained (closed) derivatives comprising 11 rings that exhibit very intense circularly polarized luminescence (CPL) (glum = 8 × 10–3) contrary to their nonconstrained (open) 10-ring precursors that are not CPL active. The relationship between structure and chiroptical properties in the series is discussed with the aid of quantum-chemical calculations.

Published
2019
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15. Full Polarization Control of Optical Planar Waveguides with Chiral Material

Author

Dalila Hadiouche, Stephan Guy, Amina Bensalah-Ledoux, Bruno Baguenard, Laure Guy, Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Université Abderrahmane Mira [Béjaïa], Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Génie de l’Environnement, Faculté de Technologie, Université de Bejaia, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, chirality, 02 engineering and technology, Planar chirality, 01 natural sciences, Ormosil, 010309 optics, Optics, Planar, 0103 physical sciences, Electrical and Electronic Engineering, Circular polarization, TE/TM polarization, integrated photonics, business.industry, planar waveguides, 021001 nanoscience & nanotechnology, Polarization (waves), Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, circular polarization, Optoelectronics, Photonics, 0210 nano-technology, business, Chirality (chemistry), Refractive index, Biotechnology
Abstract

International audience; Circularly polarized (CP) light is attracting growing interest in photonics, however it is not possible to use regular planar waveguides for the transmission of such CP light. While keeping the planar geometry, we conceived devices where the chirality of the propagation medium overcomes the planar symmetry. Thus, we report on the fabrication of chirowaveguides arising from the stacking of three layers of a new hybrid chiral organic modified silica (OrMoSil). A flexible strategy allows the control of the two main parameters impacting the ellipticity of the propagated waves. First, the high chirality of the transparent material is based on cheap and easy to access binaphthyl precursors simply shaped as films by dip-coating. Second, the refractive index (RI) contrast between the layers is finely tuned by TriEthOxySilane (TEOS) doping. The polarization of the two fundamental guided modes is measured on 2 cm long waveguides. We demonstrated that the polarization can be modulated from linear to nearly circular (80% ellipticity) depending on the RI contrast and the core thickness. These unprecedented achievements in the area of both optical materials and guided optics, open the way to fully integrated photonic devices dealing with CP light propagation.

Published
2017
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16. Chiral perovskite nanoplatelets exhibiting circularly polarized luminescence through ligand optimization

Author

Austin Hubley, Amina Bensalah‐Ledoux, Bruno Baguenard, Stephan Guy, Benjamin Abécassis, Benoit Mahler, Luminescence (LUMINESCENCE), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Matériaux et nanostructures photoniques (MNP), This article is part of a project that has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 865995, ERC CoG SENECA). B.M. thanks the Université de Lyon PALSE program under the framework 'Investissements d’avenir' (ANR-11-IDEX-0007). We thank the Consortium Lyon St-Etienne de Microscopie (CLYM) for access to the microscope platform TEM characterization and we thank Sandrine Denis-Quanquin for access to the NMR facility, ANR-11-IDEX-0007,Avenir L.S.E.,PROJET AVENIR LYON SAINT-ETIENNE(2011), and European Project: 865995,SENECA

Subjects
[PHYS]Physics [physics], [SPI]Engineering Sciences [physics], [CHIM]Chemical Sciences, circularly polarized luminescence, surface chemistry, colloidal nanocrystals, chiral perovskites, ligand-induced chirality, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Abstract

Chiral halide perovskite nanocrystals have many applications in next-generation optoelectronic devices due to their interaction with circularly polarized light. Through the careful selection of chiral organic surface ligands, control over the circular dichroism (CD) and circularly polarized luminescence (CPL) of these materials can be achieved. However, while recent developments of CD-active perovskites have seen significant advances, effective CPL remains a challenge. Here, we synthesize colloidal perovskite nanoplatelets exhibiting room temperature CPL with dissymmetry factors up to glum=4.3×10^(-3) and gabs=8.4×10^(-3). Methylammonium lead bromide nanoplatelets are synthesized with a mixture of chiral dimethyl benzyl ammonium ligands and achiral octylammonium ligands, the precise ratio of which is shown to be critical to achieving high g-factors. We investigate the competitive binding of these surface ligands using 1H NMR, and use an equilibrium model to demonstrate the ligand affinity. The magnitude of CPL and CD is quantitatively shown to exhibit a linear correlation, such that glum=0.4×gabs. Lastly, by screening several amines with close structures, we show that subtle differences in ligand structure have significant impact on the resulting CD signal of the nanoplatelets. Our findings provide new insights for the effective design of perovskites exhibiting CPL and can facilitate the development of high-performance devices based on circularly polarized luminescence.

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