AbstractThe exceptional thermal stability of diarylethene closed isomers enabled many applications but also prevented utilization in photochromic systems that require rapid thermal reversibility. Herein, we report the diaryltriazolium (DAT+) photoswitch undergoing thermal cycloreversion within a few milliseconds and absorption of the closed form in the near‐infrared region above 900 nm. Click chemistry followed by alkylation offers modular and fast access to the electron‐deficient DAT+ scaffold. In addition to excellent fatigue resistance, the introduced charge increases water solubility, rendering this photoswitch an ideal candidate for exploring biological applications.
摘要二元乙烷封闭异构体具有优异的热稳定性,可用于许多领域,但也阻碍了其在需要快速热可逆性的光致变色系统中的应用。在此,我们报告了二元三氮唑(DAT+)光开关在几毫秒内发生热环化转换,并在 900 纳米以上的近红外区域吸收封闭形式。通过点击化学和烷基化,可以模块化地快速获得缺电子的 DAT+ 支架。除了出色的抗疲劳性之外,引入的电荷还增加了水溶性,使这种光开关成为探索生物应用的理想候选物质。