Photochromic Reactions of Diarylethenes in Single Crystals with Intermolecular OH⋅⋅⋅N Hydrogen-Bonding Networks
作者:Masakazu Morimoto、Masahiro Irie
DOI:10.1002/chem.200501148
日期:2006.5.24
photochromic performance of a single crystal of a diarylethene derivative possessing carboxyl groups, 1,2-bis(5-carboxyl-2-methyl-3-thienyl)perfluorocyclopentene (1 a), and cocrystals of 1 a with 4,4'-, 2,4'-, and 2,2'-bipyridines were examined. In crystal 1 a, a discrete cyclic structure was observed, in which four 1 a molecules are linked through hydrogen bonds between the carboxyl groups. In the homocrystal
具有羧基,1,2-双(5-羧基-2-甲基-3-噻吩基)全氟环戊烯(1a)和1a与4的共晶体的二芳基乙烯衍生物的单晶的晶体结构和光致变色性能检查了4'-,2,4'-和2,2'-联吡啶。在晶体1a中,观察到离散的环状结构,其中四个1a分子通过羧基之间的氢键连接。在均晶中,1a的光反应性和光惰性的构象体以1:1的比例存在。在1 a与联吡啶的共晶体中,在1 a和吡啶基之间形成O-HN型氢键,并且所有1 a分子都固定在光反应构象中。均晶1a和共晶均表现出光致变色性能,并且观察到从蓝紫色到青色的颜色变化,