光异构化
偶氮苯
化学
光化学
紫外线
可见光谱
顺反异构
紫外线
光致变色
水溶液
光敏性
衍生工具(金融)
光电子学
异构化
分子
立体化学
有机化学
催化作用
经济
物理
金融经济学
作者
Andrew A. Beharry,Oleg Sadovski,G. Andrew Woolley
摘要
Most azobenzene-based photoswitches use UV light for photoisomerization. This can limit their application in biological systems, where UV light can trigger unwanted responses, including cellular apoptosis. We have found that substitution of all four ortho positions with methoxy groups in an amidoazobenzene derivative leads to a substantial (∼35 nm) red shift of the n−π* band of the trans isomer, separating it from the cis n−π* transition. This red shift makes trans-to-cis photoswitching possible using green light (530–560 nm). The cis state is thermally stable with a half-life of ∼2.4 days in the dark in aqueous solution. Reverse (cis-to-trans) photoswitching can be accomplished with blue light (460 nm), so bidirectional photoswitching between thermally stable isomers is possible without using UV light at all.
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