There is growing interest in developing triplet photosensitizers in terms of implementing photochemical strategies in synthetic chemistry. However, synthesis of stable triplet organic photosensitizers is nontrivial and often requires the use of heavy atoms. Herein, an alternative strategy is demonstrated to enhance the triplet generation efficiency by implanting lone-pair donor–acceptor bonds in the conjugated covalent organic frameworks (COFs). This powerful method is validated using COFs that host triazine, a moiety that has been extensively investigated in photocatalysis. Spectroscopic analysis and theoretical calculations reveal substantial improvements in the photoabsorptivity and triple-state photogeneration efficiency, consistent with catalytic tests concerning industrially relevant sulfide oxidation. These systems represent a promising addition to the rapidly increasing arsenal of synthetic photocatalytic systems.

中文翻译：

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开启光催化：在有机光敏剂中创建孤对供体-受体键以增强系统间交叉

在合成化学中实施光化学策略方面，人们对开发三重态光敏剂越来越感兴趣。然而，稳定的三线态有机光敏剂的合成并非易事，通常需要使用重原子。在此，证明了一种替代策略，通过在共轭共价有机框架（COF）中植入孤对供体-受体键来提高三重态生成效率。这种强大的方法使用含有三嗪的 COF 进行了验证，三嗪是一种在光催化领域已得到广泛研究的部分。光谱分析和理论计算揭示了光吸收率和三态光生效率的显着提高，与工业相关硫化物氧化的催化测试一致。这些系统代表了快速增长的合成光催化系统库中的一个有前途的补充。