Visible light photocatalysis could potentially address a variety of challenges in environment and energy. Here, we discuss cooperative semiconductor photocatalysis with TEMPO (2,2,6,6-tetramethylpiperidine--oxyl), a redox mediator, to aid electron transfer. In a non-conductive organic solvent, electron transfer between photocatalyst and TEMPO occurs, thereby leading to the selective oxidation of organic molecules. The photocatalyst should possess both flexible and rigid properties to ensure TEMPO-mediated electron transfer. Organic dye–semiconductors, metal–organic frameworks (MOFs), and covalent organic frameworks (COFs) have been studied to facilitate cooperative photocatalysis with TEMPO for the selective aerobic oxidation of sulfides, amines, alcohols, and alkanes. This review could help to offer new insight into mediation of electron transfer in photocatalysis and help to overcome long-standing obstacles to success.

中文翻译：

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TEMPO 半导体协同光催化

可见光光催化有可能解决环境和能源方面的各种挑战。在这里，我们讨论了与氧化还原介体 TEMPO（2,2,6,6-四甲基哌啶-氧基）配合的半导体光催化，以帮助电子转移。在非导电有机溶剂中，光催化剂和TEMPO之间发生电子转移，从而导致有机分子的选择性氧化。光催化剂应同时具有柔性和刚性特性，以确保 TEMPO 介导的电子转移。人们已经研究了有机染料半导体、金属有机骨架 (MOF) 和共价有机骨架 (COF)，以促进与 TEMPO 的协同光催化作用，用于硫化物、胺、醇和烷烃的选择性有氧氧化。这项综述有助于为光催化中电子转移的介导提供新的见解，并有助于克服长期存在的成功障碍。