<i>N</i>,<i>N</i>′-Disubstituted Indigos as Readily Available Red-Light Photoswitches with Tunable Thermal Half-Lives
作者:Chung-Yang Huang、Aurelio Bonasera、Lachezar Hristov、Yves Garmshausen、Bernd M. Schmidt、Denis Jacquemin、Stefan Hecht
DOI:10.1021/jacs.7b08726
日期:2017.10.25
Some rare indigo derivatives have been known for a long time to be photochromic upon irradiation with red light, which should be advantageous for many applications. However, the absence of strategies to tune their thermal half-lives by modular molecular design as well as the lack of proper synthetic methods to prepare a variety of such molecules from the parent indigo dye have so far precluded their
长期以来,人们就知道一些稀有的靛蓝衍生物在用红光照射时会发生光致变色,这应该有利于许多应用。然而,由于缺乏通过模块化分子设计来调整其热半衰期的策略,以及缺乏从母体靛蓝染料制备各种此类分子的适当合成方法,迄今已排除了它们的使用。在这项工作中,开发了几种 N-功能化的合成方案,并制备了多种 N-烷基和 N-芳基靛蓝衍生物。通过在 N-芳基部分上安装吸电子取代基,可以增强 Z-异构体的热稳定性,同时在用红光(660 nm LED)照射时保持有利的光开关特性。实验数据和计算结果都表明,在不影响染料吸收最大值的情况下调整热稳定性的能力源于 N-芳基的扭曲几何形状。报道的新靛蓝光开关预计将对生命科学和材料科学中光学方法和应用的发展产生重大影响。