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7 results on '"ISTM CNR, Milano"'

1. Photochromic DTE-Substituted-1,3-di(2-pyridyl)benzene Platinum(II) Complexes: Photo-modulation of Luminescence and Second-order Nonlinear Optical Properties

Author

Eleonora Garoni, Alessia Colombo, Julien Boixel, Daniele Marinotto, Véronique Guerchais, Dominique Roberto, Stefania Righetto, Hong Zhao, Denis Jacquemin, Claudia Dragonetti, Thierry Roisnel, 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), Dipartimento di Chimica, Università degli Studi di Milano [Milano] (UNIMI), ISTM CNR, Milano, Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique, INSTMMI012, National Interuniversity Consortium of Materials Science and Technology, Institut des Sciences Chimiques de Rennes ( ISCR ), Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -Ecole Nationale Supérieure de Chimie de Rennes-Institut National des Sciences Appliquées ( INSA ) -Centre National de la Recherche Scientifique ( CNRS ), Università degli studi di Milano [Milano], ISTM CNR, Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation ( CEISAM ), Université de Nantes ( UN ) -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), Università degli Studi di Milano = University of Milan (UNIMI), and Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Photoluminescence, Photoisomerization, 010405 organic chemistry, chemistry.chemical_element, 010402 general chemistry, Ring (chemistry), Photochemistry, Photochromism, 01 natural sciences, [ CHIM ] Chemical Sciences, Fluorescence, 3. Good health, 0104 chemical sciences, Inorganic Chemistry, closed-ring isomer, chemistry, Moiety, [CHIM]Chemical Sciences, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Physical and Theoretical Chemistry, Platinum, Luminescence, Isomerization
Abstract

International audience; We disclose a new family of photochromic cyclometalated platinum(II) complexes (PtDTE1 and PtDTE2), where a dithienylethene (DTE) unit is connected at the para-position of the central phenyl ring of (N^C^N) cyclometalated ligand, through two different linkages. Their syntheses are presented along with the X-ray characterizations of both the open and closed isomers of PtDTE1. The investigation of their photophysical properties is made, including absorption, photochromism, emission, and second-order nonlinear properties. We report a quantitative photo-isomerization for both PtDTE1 and PtDTE2, irrespective of the nature of the connecting mode between the DTE unit and the platinum(II) moiety. The efficient photochromism allows a significant NLO photo-modulation, both in solution and in thin films. In addition, we show that the photoluminescence of the PtDTE1 and PtDTE2 can be controlled by the open/closed isomerization of the DTE unit.

Published
2018

2. Helium-induced electronic transitions in photo-excited BA+ –HEn exciplexes

Author

Martí Pi, Marcel Drabbels, Nadine Halberstadt, Fausto Cargnoni, Patricia Vindel Zandbergen, Manuel Barranco, Théorie (LCAR), Laboratoire Collisions Agrégats Réactivité (LCAR), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona (UB), Institut de Nanociència i Nanotecnologia (IN2UB), ISTM CNR, ISTM CNR, Milano, Swiss Federal Institute of Technology at Lausanne (EPFL), Universitat de Barcelona, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse)

Subjects
Materials science, General Physics and Astronomy, 010402 general chemistry, Helium, 01 natural sciences, Molecular physics, Ion, 0103 physical sciences, Atom, Heli, Physics::Atomic and Molecular Clusters, Química quàntica, Physics::Atomic Physics, Symmetry breaking, Physical and Theoretical Chemistry, Wave functions, ComputingMilieux_MISCELLANEOUS, 010304 chemical physics, Avoided crossing, 0104 chemical sciences, Photoexcitation, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Atomic electron transition, Excited state, Relaxation (physics), Quantum chemistry, Funcions d'ona
Abstract

The possibility for helium-induced electronic transitions in a photo-excited atom is investigated using Ba+ excited to the 6p P-2 state as a prototypical example. A diabatization scheme has been designed to obtain the necessary potential energy surfaces and couplings for complexes of Ba+ with an arbitrary number of helium atoms. It involves computing new He-Ba+ electronic wave functions and expanding them in determinants of the non-interacting complex. The 6p P-2

Published
2018

3. Intriguing C-H center dot center dot center dot Cu interactions in bis-(phenanthroline)Cu(I) redox mediators for dye-sensitized solar cells

Author

Colombo, Alessia, Ossola, Rachele, Magni, Mirko, Roberto, Dominique, Jacquemin, Denis, Castellano, Carlo, Demartin, Francesco, Dragonetti, Claudia, Dipartimento di Chimica, Università degli Studi di Milano [Milano] (UNIMI), ISTM CNR, Milano, Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)

Subjects
[CHIM]Chemical Sciences
Abstract

We have synthesized and characterized a series of bis-(phenanthroline)Cu(I) complexes of interest as redox mediators for dyesensitized solar cells. This study led to the discovery of intriguing anagostic interactions between the hydrogen atom and the copper center as evidenced by X-ray diffraction studies on a single crystal. Remarkably, an anagostic interaction was found between a H atom of a methyl group and a copper site.

Published
2018

4. Highly active nanostructured palladium-ceria electrocatalysts for the hydrogen oxidation reaction in alkaline medium

Author

Hamish A. Miller, Anicet Zadick, Laetitia Dubau, Serhiy Cherevko, Huong Doan, Marcello Marelli, Marian Chatenet, Dario R. Dekel, Francesco Vizza, Sanjeev Mukerjee, Simon Geiger, Ryan Pavlicek, Istituto di Chimica dei Composti Organometallici (ICCOM), Consiglio Nazionale delle Ricerche (CNR), ISTM CNR, Milano, Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-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]), Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Gesellschaft, Helmholtz Institute Erlangen Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Northeastern University [Boston], Technion - Israel Institute of Technology [Haifa], European Union’s Horizon 2020 research and innovation programme, European Project: 721065,CREATE, and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
Materials science, Hydrogen, Inorganic chemistry, hydrogen oxidation, Platinum free, chemistry.chemical_element, 02 engineering and technology, Electrolyte, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Catalysis, Metal, chemistry.chemical_compound, Ceria, General Materials Science, Electrical and Electronic Engineering, Bifunctional, Ion exchange, Renewable Energy, Sustainability and the Environment, Fuel cell, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, visual_art, ddc:660, visual_art.visual_art_medium, 0210 nano-technology, Carbon, Anion exchange membrane, Palladium
Abstract

International audience; We report an interesting new class of bifunctional electrocatalysts, Pd/C-CeO 2 , with excellent activity and stability for the hydrogen oxidation reaction (HOR) under alkaline conditions. The unique structure of palladium deposited onto a mixed support of Vulcan XC-72 carbon and CeO 2 consists of Pd metal preferable deposited on the ceria regions of the catalyst. The CeO 2-Pd interaction leads to enhanced HOR kinetics and increased stability. Here we compare catalysts with three different Pd loadings and show that the 10 wt% Pd sample has optimized activity. Hydrogen pumping and fuel cell experiments based on this catalyst show higher activities as compared to a Pd/C sample without ceria. Metal dissolution tests and identical location transmission microscopy experiments show that the catalyst stability under harsh potential cycling experiments in alkaline medium is significantly improved as compared to Pd/C, making this material one of the best options for use as highly active and highly stable electrocatalysts for the HOR in anion exchange membrane fuel cells.

Published
2017

5. Silica 'SHB' chiral Pc-L* copper complexes for halogen-free solvent cyclopropanation reactions

Author

Vladimiro Dal Santo, B. Castano, Emma Gallo, Anne Galarneau, Yvonne C. Hönemann, Alessandro Caselli, Paolo Zardi, Rinaldo Psaro, Universita degli studi di Milano, Chimica, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), ISTM CNR, and ISTM CNR, Milano

Subjects
inorganic chemicals, CU(I) COMPLEXES, Cyclopropanation, General Chemical Engineering, Inorganic chemistry, chemistry.chemical_element, Halogen free, 010402 general chemistry, 01 natural sciences, Catalysis, chemistry.chemical_compound, Polymer chemistry, Pyridine, BIS(OXAZOLINE)-COPPER COMPLEXES, TEMPERATURE, ComputingMilieux_MISCELLANEOUS, ASYMMETRIC CYCLOPROPANATION, Olefin fiber, HETEROGENEOUS CATALYSTS, 010405 organic chemistry, ENANTIOSELECTIVE CATALYSIS, General Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, Grafting, Copper, 0104 chemical sciences, Solvent, MESOPOROUS SILICA, chemistry, MICROPOROSITY, DIELS-ALDER REACTIONS, CONTAINING MACROCYCLIC LIGANDS
Abstract

The grafting of the preformed Pc-L* (pyridine containing macrocyclic ligands) copper(I) complexes on different ordered and non-ordered silicas, and their use, under heterogeneous batch conditions, as catalysts for the olefin cyclopropanation are reported. High yields (up to 99%) and good recyclability in halogen-free solvent reactions were obtained, together with negligible copper leaching (0.1% of total copper).

Published
2013

6. Optimization of the preparation procedure of cobalt modified silicas as catalysts in methanol decomposition

Author

Tanya Tsoncheva, Alessandro Gallo, Nicola Scotti, Momtchil Dimitrov, Romain Delaigle, Eric M. Gaigneaux, Daniela Kovacheva, Vladimiro Dal Santo, Nicoletta Ravasio, Bulgarian Academy of Sciences - Sofia, ISTM-CNR, Milano - Italy, L. Malatesta University of Milan, Italy - Dept CIMA, and UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity

Subjects
Post-synthesis modification, Process Chemistry and Technology, Inorganic chemistry, KIT-6, chemistry.chemical_element, Mesoporous silica, cobalt modifications, Methanol decomposition, Catalysis, chemistry.chemical_compound, SBA-15, Adsorption, Pore topology effect, chemistry, Chemisorption, pore topology effect, Cobalt modifications, Methanol, Cobalt, Cobalt oxide, post-synthesis modification, Incipient wetness impregnation
Abstract

Novel modified “chemisorption–hydrolysis” technique and conventional “incipient wetness impregnation” procedure were compared for loading of cobalt species on mesoporous silica supports. Effect of cobalt amount, pH of the precursor solution, duration of the “chemisorption” procedure and pre-treatment medium, as well as topological characteristics of the mesoporous silica support were investigated. The state of the loaded cobalt species was studied by XRD, FTIR, FTIR of adsorbed pyridine, UV–vis, XPS and TPR methods and their catalytic properties were elucidated in methanol decomposition to hydrogen and carbon monoxide. The “incipient wetness impregnation” technique facilitates the formation of finely dispersed spinel cobalt oxide species. Their catalytic activity could be significantly increased by hydrogen pretreatment, but the effect is more pronounced when mesoporous silica with ordered pseudo 1D pore structure (SBA-15) is used as a support. The modified “chemisorption–hydrolysis” procedure facilitates the formation of strongly interacting with the support cobalt species, which are stable under the reduction conditions. Their properties could be regulated during the modification procedure, by varying the cobalt content and pH of the impregnated solution as well as by the duration of the “chemisorption” procedure.

Published
2012

7. Palladium–Ceria Catalysts with Enhanced Alkaline Hydrogen Oxidation Activity for Anion Exchange Membrane Fuel Cells

Author

Hamish A. Miller, Dario R. Dekel, Lianqin Wang, Jasna Jankovic, Chethana B. Krishnamurthy, Francesco Vizza, Sanjeev Mukerjee, Elena S. Davydova, John R. Varcoe, Anna Lenarda, Marco Bellini, Qingying Jia, Maria V. Pagliaro, Massimo Innocenti, Paolo Fornasiero, Ilya Grinberg, Claudio Evangelisti, Marcello Marelli, Bellini, M., Pagliaro, M. V., Lenarda, A., Fornasiero, P., Marelli, M., Evangelisti, C., Innocenti, M., Jia, Q., Mukerjee, S., Jankovic, J., Wang, L., Varcoe, J. R., Krishnamurthy, C. B., Grinberg, I., Davydova, E., Dekel, D. R., Miller, H. A., Vizza, F., ISTM CNR, Milano, CNR-Instituto di Science e tecnologie Moleculari, Northeastern University [Boston], University of Surrey - Department of Chemistry - Centre for Petroleum and Surface Chemistry, Technion - Israel Institute of Technology [Haifa], Istituto di Chimica dei Composti Organometallici (ICCOM), Consiglio Nazionale delle Ricerche (CNR), European Project: 721065,CREATE, University of Surrey (UNIS), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
Hydrogen, platinum free, ceria palladium, Energy Engineering and Power Technology, chemistry.chemical_element, Proton exchange membrane fuel cell, 02 engineering and technology, Electrolyte, fuel cells, 010402 general chemistry, anion exchange membrane, ceria, palladium, 01 natural sciences, 7. Clean energy, Catalysis, fuel cell, Materials Chemistry, Electrochemistry, Chemical Engineering (miscellaneous), [CHIM]Chemical Sciences, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, Ion exchange, Chemistry, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Membrane, Chemical engineering, 0210 nano-technology, Platinum, Palladium
Abstract

Anion exchange membrane fuel cells (AEMFCs) offer several important advantages with respect to proton exchange membrane fuel cells, including the possibility of avoiding the use of platinum catalysts to help overcome the high cost of fuel cell systems. Despite such potential benefits, the slow kinetics of the hydrogen oxidation reaction (HOR) in alkaline media and limitations in performance stability (because of the degradation of the anion conducting polymer electrolyte components) have generally impeded AEMFC development. Replacing Pt with an active but more sustainable HOR catalyst is a key objective. Herein, we report the synthesis of a Pd–CeO2/C catalyst with engineered Pd-to-CeO2 interfacial contact. The optimized Pd–CeO2 interfacial contact affords an increased HOR activity leading to ˃1.4 W cm–2 peak power densities in AEMFC tests. This is the only Pt-free HOR catalyst yet reported that matches state-of-the-art AEMFC power performances (˃1 W cm–2). Density functional theory calculations suggest that the exceptional HOR activity is attributable to a weakening of the hydrogen binding energy through the interaction of Pd atoms with the oxygen atoms of CeO2. This interaction is facilitated by a structure that consists of oxidized Pd atoms coordinated by four CeO2 oxygen atoms, confirmed by X-ray absorption spectroscopy.

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