Photochromism of cationic spiropyran-doped silica gels

Authors
Leaustic, A Dupont, A Yu, P Clement, R
Citation
A. Leaustic et al., Photochromism of cationic spiropyran-doped silica gels, NEW J CHEM, 25(10), 2001, pp. 1297-1301
Citations number
25
Categorie Soggetti
Chemistry
Journal title
NEW JOURNAL OF CHEMISTRY
ISSN journal
11440546 → ACNP
Volume
25
Issue
10
Year of publication
2001
Pages
1297 - 1301
Database
ISI
SICI code
1144-0546(200110)25:10<1297:POCSSG>2.0.ZU;2-R
Abstract
New cationic spiropyrans, (SP-R)X-+(-) (R = Me, Ph, Hex, C2H4OH; X = 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 stud ies of these new spiropyran-doped gels provide evidence for negative solvat ochromism and for a competition between normal and reverse photochromism.