Aromaticity-Controlled Thermal Stability of Photochromic Systems Based on a Six-Membered Ring as Ethene Bridges: Photochemical and Kinetic Studies
作者:Yuheng Yang、Yongshu Xie、Qiong Zhang、Keitaro Nakatani、He Tian、Weihong Zhu
DOI:10.1002/chem.201200354
日期:2012.9.10
forms a twin crystal of asymmetric nature with interactions between the electron‐rich oxygen atom of the methoxy group and the carbon atom of the electron‐deficient benzobisthiadiazole moiety. This work contributes to the understanding of aromaticity‐controlled thermal stability of photochromic systems based on a six‐membered ring as an ethene bridge, and a broadening of the novel building blocks for photochromic
三种光致变色化合物-2-丁基-5,6-双[5-(4-甲氧基苯基)-2-甲基噻吩-3-基] -1 H-苯并[ de ]异喹啉-1,3(2 H)-二酮( BTE-NA),含有萘二甲酰亚胺的4,5-双[5-(4-甲氧基苯基)-2-甲基噻吩-3-基]苯并[ c ] [1,2,5]噻二唑(BTA)和BTTA,对苯并噻二唑和苯并二噻二唑作为具有不同芳族性的六元乙烯桥进行了系统研究,包括溶液状态,溶胶-凝胶状态和单晶状态。它们表现出典型的光致变色性能,并具有相当高的环化量子产率。BTE-NA,BTA和BTTA构成了典型的供体-π-受体(D–π–A)系统在激发后在HOMO和LUMO之间具有显着的分子内电荷转移(ICT),从而实现了光致变色和溶剂致变色的荧光调制。具有不同芳香度的三个乙烯桥可以提供系统比较其相应封闭形式(c-BTE-NA,c-BTA和c-BTTA)的热稳定性的变化。c-BTE-NA在从环