In this paper, two types of conjugated, triazine-based covalent organic frameworks (COFs) with different connected linkages (imine bond and sp²-carbon-CN bond) are presented. The insignificant difference in the linkages creates a remarkable difference in their performance in visible-light-driven hydrogen generation. The fully π-conjugated two-dimensional (2D) COF with sp²-carbon-CN linkages showed an external quantum efficiency of 13.48% at 450 nm, which is an unprecedented result for COF photocatalysts. In contrast, the imine-linked 2D COF displayed almost no photoactivity. Further photoelectrochemical and quantum chemical studies provide an in-depth understanding of the catalytic mechanism. This finding provides new insight into preparing high-performance organic photocatalysts for solar energy conversion.

在本文中，介绍了两种具有不同连接键（亚胺键和 sp ² -碳-CN 键）的共轭三嗪基共价有机框架 (COF)。连接的微小差异导致它们在可见光驱动的氢气产生中的性能显着差异。^{具有 sp 2}的完全 π 共轭二维 (2D) COF-碳-CN 连接在 450 nm 处显示出 13.48% 的外部量子效率，这对于 COF 光催化剂来说是前所未有的结果。相比之下，亚胺连接的 2D COF 几乎没有光活性。进一步的光电化学和量子化学研究提供了对催化机制的深入理解。这一发现为制备用于太阳能转化的高性能有机光催化剂提供了新的思路。