Multistate Photochromism of 1-Phenylnaphthalene-Bridged Imidazole Dimer That Has Three Colorless Isomers and Two Colored Isomers
作者:Tetsuo Yamaguchi、Sayaka Hatano、Jiro Abe
DOI:10.1021/jp411190d
日期:2014.1.9
A new type of the bridged imidazole dimer with a 1-phenylnaphthalene moiety that bridges two diphenylimidazole units at the 2- and 2′-positions was synthesized and the photochemical and thermochemical properties were investigated. This molecule shows unique multistate photochromism, in which the stable colorless 1,2′-isomers A and B photochemically isomerize to the colorless 2,2′-isomer through the
合成了一种新型的桥联咪唑二聚体,其具有在2-和2'-位桥接两个二苯基咪唑单元的1-苯基萘部分,并研究了其光化学和热化学性质。该分子显示出独特的多态光致变色现象,其中稳定的无色1,2'-异构体A和B通过短寿命的双自由基在25°C下半衰期为180 ns,光化学异构化为无色的2,2'-异构体。在升高的温度下,2,2'-异构体通过有色异构体热返回到1,2'-异构体A和B。分离1,2,-异构体A和B,2,2'-异构体和有色异构体,并通过X射线晶体学分析确定它们的分子结构。这些异构体在室温下稳定,并且可以通过光照射几乎完全转化为2,2'-异构体。