Covalent grafting of optically active molecules on silica gels

Authors

  • Jean-Pierre Boilot,

    1. Groupe de Chimie due Solide, Laboratoire de Physique de la Maitière Condensée, Ecole Polytechnique, CNRS URA D 1254, 91128 Palaiseau, France
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  • Frédéric Chaput,

    1. Groupe de Chimie due Solide, Laboratoire de Physique de la Maitière Condensée, Ecole Polytechnique, CNRS URA D 1254, 91128 Palaiseau, France
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  • Jean-Pierre Galaup,

    1. Laboratoire de Photophysique et de Photochimie Supramoléculaires et Macromoléculaires, CNRS URA 1906, ENS de Cachan, 94235 Cachan, France
    Current affiliation:
    1. Laboratoire Aimé Cotton. Bât. 505. Université Paris Sud, 91405 Orsay cedex, France
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  • Anne-Valentine Veret-Lemarinier,

    1. Laboratoire de Photophysique et de Photochimie Supramoléculaires et Macromoléculaires, CNRS URA 1906, ENS de Cachan, 94235 Cachan, France
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  • Didier Riehl,

    1. Groupe d'Optique Non Linéaire, Institute d'Optique Théorique el Appliquée, CNRS URA 14, 91403 Orsay, France
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  • Yves Lévy

    1. Groupe d'Optique Non Linéaire, Institute d'Optique Théorique el Appliquée, CNRS URA 14, 91403 Orsay, France
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Abstract

Active organic molecules are grafted on the xerogel silica matrix by using functionalized alkoxides f-R′–Si(OEt)3, where f is a chemical function and R′ is an alkyl spacer to limit the degrees of freedom of the molecules. Organic-inorganic hybrid films are prepared in which optically nonlinear DRl chromophores are covalently bound to the silica network. These films exhibit a large and stable second-order nonlinear coefficient from second harmonic generation experiments. Protoporphyrin molecules are attached double covalently to the xerogel matrix via flexible organic spacers. Persistent spectral holes are still burnt with moderate fluency at 120 K.

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