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Covalent grafting of optically active molecules on silica gels
Author(s) -
Boilot JeanPierre,
Chaput Frédéric,
Galaup JeanPierre,
VeretLemarinier AnneValentine,
Riehl Didier,
Lévy Yves
Publication year - 1997
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690431329
Subject(s) - covalent bond , molecule , grafting , chromophore , alkyl , matrix (chemical analysis) , covalent organic framework , polymer chemistry , materials science , chemistry , chemical engineering , photochemistry , organic chemistry , polymer , composite material , engineering
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.