Fast thermal cis-trans isomerization of heterocyclic azo dyes in PMMA polymers

被引：41

作者：

Coelho, Paulo J. ^{[1
]}

Sousa, Ceu M. ^{[1
]}

Castro, M. Cidalia R. ^{[2
]}

Fonseca, A. Mauricio C. ^{[2
]}

Raposo, M. Manuela M. ^{[2
]}

机构：

[1] Univ Tras Os Montes & Alto Douro, Ctr Quim Vila Real, P-5001801 Vila Real, Portugal

[2] Univ Minho, Ctr Quim, P-4710057 Braga, Portugal

来源：

OPTICAL MATERIALS | 2013年 / 35卷 / 06期

关键词：

Heterocyclic azo dyes; Optical switching; Thermal cis-trans isomerization; PMMA; Molecular switches; NONLINEAR-OPTICAL PROPERTIES; PHOTOINDUCED BIREFRINGENCE; AZOBENZENE; THIENYLPYRROLE; SERIES; PHOTOCHEMISTRY; PHOTOCHROMISM; THIAZOLE; COMPOUND; KINETICS;

D O I：

10.1016/j.optmat.2013.01.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A series of heterocyclic azo dyes were dispersed in poly(methyl methacrylate) (PMMA) matrix and the photochromic properties of the coloured films studied by UV-Vis spectroscopy. Visible irradiation of the coloured films lead to a fast decrease in the colour intensity due to the trans-cis photoisomerization reaction. When the light source was removed the spontaneous thermal cis-trans reverse isomerization occurred bringing the absorbance back to initial value with variable speed. Contrary to common azobenzenes that after photoisomerization with UV or visible light exhibit very slow thermal cis-trans back reisomerization, that can last for hours or days, azo dyes bearing pyrrole, thiophene, thiazole or thiadiazole heterocycles display very fast switching between the two isomers (few seconds) even when dispersed in PMMA polymers. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：1167 / 1172

页数：6

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