Tripodal triazole-linked azo(hetero)arene-based photoswitchable catalysts T1–5 have been designed, synthesized and optimized for the tritylation reaction of benzylamine (BzNH₂). The tritylation reaction rates/yields achieved by light induced isomerization are compared between the native and photoswitched states of the catalyst T1. This concept of controlling the tritylation reaction rates with light has also been extended to additional substrates. The critical role of the triazole C–H⋯Cl⁻ interactions has been confirmed by a combination of spectroscopic, calorimetric and computational studies. Also, the effect of variation in the binding affinities between the native and photoswitched states of the catalyst at room temperature in the temporal control of the catalysis has been demonstrated.

中文翻译：

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通过氯离子结合催化的光驱动变化对三苯甲基反应的时间控制–概念证明

三脚架三唑连接的偶氮（杂）芳烃基光可催化剂T1 - 5已经被设计，合成和苄胺三苯甲基化反应（BzNH优化₂）。在催化剂T1的自然状态和光开关状态之间比较通过光诱导的异构化获得的三苯甲基化反应速率/产率。用光控制三苯甲基反应速率的这一概念也已经扩展到另外的底物上。三唑C-H⋯氯的关键作用^-光谱，量热和计算研究相结合已证实相互作用。而且，已经证明了在催化剂的时间控制中，在室温下催化剂的天然和光开关状态之间的结合亲和力变化的影响。