Photochromism of cationic spiropyran-doped silica gels
Le′austic, Anne; Dupont, Agnès; Yu, Pei; Cle′ment, Rene′; Léaustic Anne; Laboratoire de Chimie Inorganique (CNRS UMR 8613), Uni.italv;ersité Paris-Sud; Dupont Agnès; Laboratoire de Chimie Inorganique (CNRS UMR 8613), Uni.italv;ersité Paris-Sud; Yu Pei; Laboratoire de Chimie Inorganique (CNRS UMR 8613), Uni.italv;ersité Paris-Sud; Clément René; Laboratoire de Chimie Inorganique (CNRS UMR 8613), Uni.italv;ersité Paris-Sud
Журнал:
New Journal of Chemistry
Дата:
2001
Аннотация:
New cationic spiropyrans (SPâ R)<sup>+</sup>X<sup>â </sup> (Râ =â Me, Ph, Hex, C2H4OH; Xâ =â I, Cl, NO3) have been synthesised and embedded in a silica gel prepared from the gelation of TMOS (tetramethyloxysilane). The influence of the substituent R and of the anion on the gelation time has been studied. Spectroscopic studies of these new spiropyran-doped gels provide evidence for negative solvatochromism and for a competition between normal and reverse photochromism.
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