Structural Design Principle of Small-Molecule Organic Semiconductors for Metal-Free, Visible-Light-Promoted Photocatalysis

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• 作者：Lei Wang ; Wei Huang ; Run Li ; Dr. Dominik Gehrig ; Prof. Paul W. M. Blom ; Prof. Katharina Landfester and Dr. Kai A. I. Zhang
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 8, 2016
• 年：2016
• 卷：55
• 期：33
• 页码：9783-9787
• 全文大小：1284K
• ISSN：1521-3773

文摘

Herein, we report on the structural design principle of small-molecule organic semiconductors as metal-free, pure organic and visible light-active photocatalysts. Two series of electron-donor and acceptor-type organic semiconductor molecules were synthesized to meet crucial requirements, such as 1) absorption range in the visible region, 2) sufficient photoredox potential, and 3) long lifetime of photogenerated excitons. The photocatalytic activity was demonstrated in the intermolecular C−H functionalization of electron-rich heteroaromates with malonate derivatives. A mechanistic study of the light-induced electron transport between the organic photocatalyst, substrate, and the sacrificial agent are described. With their tunable absorption range and defined energy-band structure, the small-molecule organic semiconductors could offer a new class of metal-free and visible light-active photocatalysts for chemical reactions.