Li Guoping, Xu Letian, Zhang Weidong, Zhou Kun, Ding Yousong, Liu Fenglin, He Xiaoming, He Gang
Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi Province, 710054, China.
School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China.
Angew Chem Int Ed Engl. 2018 Apr 23;57(18):4897-4901. doi: 10.1002/anie.201711761. Epub 2018 Mar 26.
A series of electron-accepting chalcogen-bridged viologens with narrow HOMO-LUMO bandgaps and low LUMO levels is reported. The optoelectronic properties of chalcogenoviologens can be readily tuned through heavy atom substitution (S, Se and Te). Herein, in situ electrochemical spectroscopy was performed on the proof-of-concept electrochromic devices (ECD). E-BnV (E=Se, Te; BnV =benzyl viologen) was used for the visible-light-driven hydrogen evolution due to the strong visible-light absorption. Remarkably, E-BnV was not only used as a photosensitizer, but also as an electron mediator, providing a new strategy to explore photocatalysts. The higher apparent quantum yield of Se-BnV could be interpreted in terms of different energy levels, faster electron-transfer rates and faster formation of radical species.
报道了一系列具有窄HOMO-LUMO带隙和低LUMO能级的电子接受型硫族元素桥连紫精。硫族元素紫精的光电性质可通过重原子取代（S、Se和Te）轻松调节。在此，对概念验证电致变色器件（ECD）进行了原位电化学光谱研究。由于强烈的可见光吸收，E-BnV（E=Se、Te；BnV=苄基紫精）用于可见光驱动的析氢反应。值得注意的是，E-BnV不仅用作光敏剂，还用作电子介质，为探索光催化剂提供了一种新策略。Se-BnV较高的表观量子产率可以从不同的能级、更快的电子转移速率和更快的自由基物种形成方面来解释。
