Enhanced photocatalytic performance of tetraphenylethylene-based porous aromatic frameworks by bandgap adjustment for the synthesis of benzimidazoles†

EES catalysis Pub Date : 2024-06-07 DOI:10.1039/D4EY00071D

He Wang, Xinmeng Xu, Linzhu Cao, Zhenwei Zhang, Jiali Li, Xiaoming Liu, Xin Tao and Guangshan Zhu

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Abstract

Porous aromatic frameworks (PAFs) as visible-light active and reusable photocatalysts provide a green and sustainable alternative to conventional metal-based photocatalysts. In this study, we design and synthesize three novel photoactive tetraphenylethylene (TPE) based PAF photocatalysts (TPE-PAFs) linked with thiophene units in an alternating donor (D)–acceptor (A) fashion. Photoelectrochemical measurements show that the introduction of different thiophene units can effectively regulate the optical band gap and energy level, which may further determine their photocatalytic performance. As a result, TPE-PAFs achieve excellent yields (up to 99%), broad substrate scope and high recyclability (up to 10 cycles) for the photosynthesis of benzimidazoles. The photocatalytic reaction is successfully monitored using in situ IR spectra. This work provides a feasible approach for designing PAFs with high photocatalytic activity and broadens the application of PAFs for photocatalytic organic transformations.

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通过带隙调整增强四苯乙烯基多孔芳香族框架的光催化性能以合成苯并咪唑

多孔芳香族框架（PAFs）作为具有可见光活性且可重复使用的光催化剂，为传统的金属基光催化剂提供了一种绿色、可持续的替代品。在本研究中，我们设计并合成了三种新型光活性四苯基乙烯（TPE）基 PAF 光催化剂（TPE-PAFs），它们以供体（D）-受体（A）交替的方式与噻吩单元相连。光电化学测量结果表明，引入不同的噻吩单元可有效调节光带隙和能级，从而进一步决定其光催化性能。因此，TPE-PAFs 在苯并咪唑类化合物的光合作用中实现了优异的产率（高达 99%）、广泛的底物范围和高度的可回收性（高达 10 次循环）。利用原位红外光谱成功监测了光催化反应。这项工作为设计具有高光催化活性的 PAFs 提供了一种可行的方法，并拓宽了 PAFs 在光催化有机转化中的应用。

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EES catalysis

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