Peng Xueqing, Tian Yue, Yang Tao, Wang Xi, Song Chunmei, Kong Aiguo
School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, P. R. China.
ACS Appl Mater Interfaces. 2024 Jul 31;16(30):40180-40189. doi: 10.1021/acsami.4c06179. Epub 2024 Jul 17.
Two π-conjugated covalent organic frameworks (COFs) with nonring imine or benzoxazole ring linkages were prepared by reacting 3,3'-dihydrooxybenzidine (BDOH) with 3,5-triformylbenzene (Tb) in the presence or absence of benzimidazole (BDOH-Tb- and BDOH-Tb-). Although two COFs indicated similar composition, crystalline structures, and morphologies, imine-based BDOH-Tb- exhibited a photocatalytic HO production rate of 2490 μmol·g·h in sacrificial reagent-free pure water, higher than that of benzoxazole-based BDOH-Tb- (1168 μmol·g·h). The higher photocatalytic activity of BDOH-Tb- was attributed to its more efficient photoinduced charge separation and utilization efficiency and different 2e ORR active sites over the two COFs. This study demonstrated an available ring effect to adjust photocatalytic performance between π-conjugated COFs.
通过使3,3'-二羟基联苯胺（BDOH）与3,5-三甲酰基苯（Tb）在有或没有苯并咪唑的情况下反应，制备了两种具有非环亚胺或苯并恶唑环连接的π共轭共价有机框架（COF）（BDOH-Tb-和BDOH-Tb-）。尽管两种COF显示出相似的组成、晶体结构和形态，但基于亚胺的BDOH-Tb-在无牺牲试剂的纯水中表现出2490 μmol·g·h的光催化产氢速率，高于基于苯并恶唑的BDOH-Tb-（1168 μmol·g·h）。BDOH-Tb-较高的光催化活性归因于其更有效的光生电荷分离和利用效率以及两种COF上不同的2e氧还原反应活性位点。该研究证明了一种有效的环效应来调节π共轭COF之间的光催化性能。
