Photochromic properties of terarylene derivatives having a π-conjugation unit on central aromatic ring
作者:Yuichiro Kutsunugi、Shigekazu Kawai、Takuya Nakashima、Tsuyoshi Kawai
DOI:10.1039/b823413b
日期:——
A series of terarylenes based on 4,5-bisbenzothienylthiazole have been synthesized, and their photochromic properties are studied both in solution and in the crystalline state. The substitution effect of the central aromatic ring on the photochromic reactivity were also studied. The introduction and expansion of the π-conjugated system at the 2-position of the thiazole ring led to a red-shift of the
一系列基于 4,5-双苯并噻吩并噻唑已经合成了它们,并在溶液和结晶状态下研究了它们的光致变色特性。还研究了中心芳环对光致变色反应性的取代作用。噻唑环2位上π共轭体系的引入和扩展导致亚芳基的开环和闭环异构体的吸收峰发生红移。4,5-双苯并噻吩并噻唑的2-氢和2-苯基衍生物即使在单晶状态下也显示出光致变色反应。X射线晶体分析表明其分子结构具有准C 2对称性,表明存在显着的CH⋯N和CH⋯S相互作用。尽管2-氢和2-苯基衍生物表现出超过0.5的高光环化反应量子产率,但是尽管2-苯基噻吩基衍生物具有与其他两种衍生物相似的构象,但它们显示出相当小的反应性。同时,这些分子显示出类似的光环回复量子产率,最高可达0.3。还通过量子化学计算讨论了它们的电子结构与光致变色反应性之间的关系。