PHOTOISOMERIZATION OF AN AZOBENZENE IN SOL-GEL GLASS-FILMS

被引：46

作者：

UEDA, M ^{[1
]}

KIM, HB ^{[1
]}

IKEDA, T ^{[1
]}

ICHIMURA, K ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,DIV PHOTOCHEM PROC,RESOURCES UTILIZAT RES LAB,4259 NAGATSUTA,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

CHEMISTRY OF MATERIALS | 1992年 / 4卷 / 06期

关键词：

D O I：

10.1021/cm00024a022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sol-gel films of tetraethyl orthosilicate (TEOS) doped with 4-methoxy-4'-(2-hydroxyethoxy)azobenzene (MHAB) were prepared under various conditions. The trans-cis photoisomerization and the thermally induced cis-trans reversion of MHAB in the sol-gel films were studied and compared with that in poly(methyl methacrylate) (PMMA) film or in solution. An increased absorption between the pi-pi* and the n-pi* absorption bands observed in sol-gel films doped with MHAB was attributed to hydrogen bond between the azo group and silanol groups. The cis fraction in the photostationary state in sol-gel films was much smaller than in PMMA. This suggests that the sol-gel matrix is more rigid than PMMA. The rigidity of the matrix in the sol-gel glass depends on the water concentration during its preparation.

引用

页码：1229 / 1233

页数：5

共 35 条

[1] THE NATURE OF THE SILICA CAGE AS REFLECTED BY SPECTRAL CHANGES AND ENHANCED PHOTOSTABILITY OF TRAPPED RHODAMINE-6G [J].