Liu Huan-huan, Chen Yi
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100080, China.
J Phys Chem A. 2009 May 14;113(19):5550-3. doi: 10.1021/jp810919j.
A class of diarylethenes with a imidazole bridge unit has been synthesized and shows photochromic properties with UV/vis light irradiation. It is found that electronic properties of substituent in the imidazole bridge unit have a great effect on both photochromism and fluorescence of diarylethenes because of intramolecular charge transfer. Both "turn-on" and "turn-off" fluorescent diarylethenes systems can be achieved by simple modification of molecular structure and electronic properties of substituent, which provides a strategy for the design of new fluorescent diarylethene systems to be used as switches.
一类具有咪唑桥联单元的二芳基乙烯已被合成，并在紫外/可见光照射下表现出光致变色特性。研究发现，由于分子内电荷转移，咪唑桥联单元中取代基的电子性质对二芳基乙烯的光致变色和荧光都有很大影响。通过简单改变分子结构和取代基的电子性质，既可以实现“开启”型也可以实现“关闭”型荧光二芳基乙烯体系，这为设计用作开关的新型荧光二芳基乙烯体系提供了一种策略。
