苯并三唑
亚胺
化学
取代基
光催化
共价键
烷基
结构异构体
共价有机骨架
催化作用
光化学
有机化学
立体化学
组合化学
作者
Ting Wang,Mingjie Li,Yijun Chen,Xinpeng Che,Fuzhen Bi,Yuhong Yang,Renqiang Yang,Chaoxu Li
标识
DOI:10.1021/acscatal.3c04145
摘要
Despite the fact that close correlation has been established between the structures of covalent organic frameworks (COFs) and their photocatalytic properties, the effect of COF isomerism has been rarely studied so far due to the limited number of isomeric precursors available for the synthesis of COF isomers. In this study, regioisomeric benzotriazole-based COFs were prepared, with the alkyl substituent group located at the middle or side nitrogen. In spite of possessing an identical molecular formula, the COF isomers showed distinct photophysical and electrochemical properties. When serving as photocatalysts, the symmetric COF isomer exhibited a hydrogen evolution rate up to 24.21 mmol h–1 g–1 under natural outdoor conditions or 19.77 mmol h–1 g–1 under simulated visual light irradiation, which was much higher than the asymmetrical isomer. This study enriches the family of imine-linked COFs and provides insights into the photocatalysis mechanism from a subtle perspective of regioisomers.
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