Syntheses and Substituent Effects on the Properties of Unsymmetrical Photochromic Diarylethenes Bearing a Benzothiophene Unit
作者:Shouzhi Pu、Min Li、Gang Liu、Zhanggao Le
DOI:10.1071/ch08289
日期:——
Photochromic unsymmetrical diarylethenes 1a–5a that bear different electron-donating or electron-withdrawing substitutes have been synthesized, and the structures of 2a–5a determined by single-crystal X-ray diffraction analysis. Substituent effects on their optoelectronic properties, including photochromism, fluorescence, and electrochemical properties are investigated in detail. The strong electron-donating
合成了带有不同给电子或吸电子取代基的光致变色不对称二芳基蒽1a - 5a,并通过单晶X射线衍射分析确定了2a - 5a的结构。详细研究了取代基对其光电性能的影响,包括光致变色,荧光和电化学性能。强电子给体取代基对闭环异构体的最大吸收量和摩尔系数具有有效的贡献,而吸电子取代基可将二芳烃的最大吸收量显着转移至更长的波长并增加其环化量子产率。二芳烃2,3和4在溶液中和在单结晶相表现出良好的光致变色。但是,双芳烃5在结晶相中没有显示光致变色现象。当用紫外线和可见光交替照射时,二芳烃1、2和3表现出良好的荧光转换,并且它们在光固定状态下的荧光转化率在己烷中均大于80%。另外,循环伏安图测试表明,不同的给电子和吸电子取代基对这些二芳基蒽的电化学行为具有显着影响。