作者:Tadatsugu Yamaguchi、Yusuke Kamihashi、Toru Ozeki、Ayaka Uyama、Jun-ichiro Kitai、Megumi Kasuno、Kimio Sumaru、Yoshiro Kimura、Satoshi Yokojima、Shinichiro Nakamura、Masakazu Morimoto、Kingo Uchida
DOI:10.1246/bcsj.20130252
日期:2014.4.15
Three types of diarylethenes having one phenol moiety as an aromatic unit were synthesized in order to control pH change upon irradiation with UV and visible light. Upon irradiation with 313 nm light, these open-ring isomers were transformed to thermally unstable colored isomers in methanol solution. During the storage of the photoirradiated diarylethene solutions in the dark for 10 min, the thermally unstable closed-ring isomers were converted to thermally stable keto isomers. The structures of these isomers were characterized by 1H NMR and X-ray crystallography. The keto isomers were transformed to the initial phenol isomer upon irradiation with visible light. Additionally, we also found the formation of a novel photochromic diarylethene derivative having one keto group on the cyclopentane ring during UV irradiation. A pH change between the two isomers was observed in a mixture of ethanol and water.
为了控制紫外线和可见光照射时的pH变化,合成了三种具有一个苯酚部分作为芳香族单元的二芳基乙烯。在 313 nm 光照射下,这些开环异构体在甲醇溶液中转化为热不稳定的有色异构体。将光照射的二芳基乙烯溶液在黑暗中储存10分钟期间,热不稳定的闭环异构体转化为热稳定的酮异构体。这些异构体的结构通过1H NMR和X射线晶体学进行了表征。在可见光照射下,酮异构体转化为最初的苯酚异构体。此外,我们还发现在紫外线照射下形成了一种新型光致变色二芳基乙烯衍生物,该衍生物在环戊烷环上具有一个酮基。在乙醇和水的混合物中观察到两种异构体之间的pH变化。