single-crystalline phase. The derivatives showed reversible photochromic reactions and turn-on mode photoswitching of fluorescence in solution as well as in the single-crystalline phase. Upon irradiation with UV light, the open-ring isomers in the crystals underwent cyclization reactions to produce fluorescent closed-ring isomers. The UV-irradiated crystals emitted green or yellow-green fluorescence and exhibited
两种具有苯并[ b ]
噻吩S,S的二芳基
乙烯衍
生物的光致变色和荧光性质在单晶相中研究了-二氧化物基团。衍
生物在溶液中以及在单晶相中显示出可逆的光致变色反应和荧光的开启模式光开关。在用紫外线照射时,晶体中的开环异构体进行环化反应以产生荧光闭环异构体。紫外线照射的晶体发出绿色或黄绿色荧光,并在线性偏振光下表现出其吸收和荧光光谱的二向色性。在可见光照射下,闭环异构体恢复为开环异构体,晶体的荧光消失。开关周期可以重复50次以上,而不会出现明显的劣化。