Although the topologies of covalent organic frameworks (COFs) can be controlled mainly by varying the symmetries of the building blocks condensed to form the structures, another approach is to change the structures of blocks but retain the same symmetries. The construction of a single COF featuring pores of different sizes from two symmetrical building blocks remains extremely difficult. In this paper, we report an investigation into the effect of hydrogen bonding on the topological regulation of two-dimensional COFs as a new approach for managing their properties. Our strategy involved introducing pristine and substituted diamine monomers—benzidine (BD) and 1,4-dihydroxybenzidine (DHBD)—into the skeleton of bicarbazole-based COFs. The constructed bicarbazole-based COFs, Cz-BD and Cz-DHBD, were designed using a (C₂ + C₂) geometry strategy and synthesized through Schiff-base condensations of bicarbazole-4CHO and the benzidine derivatives. The resulting COFs featured two different topologies: Cz-BD COF possessing a single type of pore having a tetragonal structure, and Cz-DHBD COF possessing a Kagome structure featuring two types of pores (one hexagonal and the other triangular with mesoporous and microporous structure, induced by intramolecular OH···N hydrogen bonding). These COFs exhibited high crystallinity, great thermal stability, and large surface areas, as well as synergistic structural effects and high-performance CO₂ uptake.

尽管共价有机框架（COF）的拓扑结构主要可以通过改变缩合形成结构的结构单元的对称性来控制，但另一种方法是更改​​结构块的结构但保持相同的对称性。用两个对称的结构块构造具有不同尺寸的孔的单个COF仍然非常困难。在本文中，我们报告了对氢键对二维COF拓扑调整的影响的研究，这是一种管理其特性的新方法。我们的策略涉及将原始的和取代的二胺单体（联苯胺（BD）和1,4-二羟基联苯胺（DHBD））引入到基于联咔唑的COF的骨架中。所构建的基于联咔唑的COF，Cz-BD和Cz-DHBD是使用（C ₂+ C ₂）几何策略，并通过联咔唑-4CHO和联苯胺衍生物的席夫碱缩合反应合成。生成的COF具有两种不同的拓扑结构：Cz-BD COF具有一种具有四边形结构的孔，而Cz-DHBD COF具有具有两种类型的孔的Kagome结构（一种是六边形，另一种是具有中孔和微孔结构的三角形，由分子内的OH ··· N氢键诱导）。这些COF表现出高结晶度，出色的热稳定性和较大的表面积，以及协同的结构效应和高性能的CO ₂吸收。