The cyclization reaction of diarylethenes having an azulene ring occurs only via higher excited states. Novel diarylethenes having an azulene ring with a strong donor or acceptor were synthesized and examined in these reactions. A derivative having an electron‐donating 1,3‐benzodithiol‐2‐ylidenemethyl group at the 1‐position of the azulene ring showed photochromism, whereas neither a derivative having
具有a环的二
芳烃的环化反应仅通过较高的激发态发生。在这些反应中合成并检查了具有带有强供体或受体的a环的新型二
芳烃。在a环1位具有给电子的
1,3-苯并二硫醇-2-亚甲基的衍
生物没有显示出光致变色,而在neither 3位具有π共轭给电子基的衍
生物均不显示光致变色。环或在z环的1或3位上具有π共轭吸电子基团的衍
生物均未显示任何光致变色现象。这些化合物的光反应性是通过使用密度泛函理论(DFT)和时间依赖(TD)-DFT计算激发态的力和键序来解释的。