Although a lot of covalent organic frameworks (COFs) have been constructed over the past 10 years, the topologies of COFs are still quite limited. In this work, we report one-step construction of a COF with an unprecedented topology from the combination of C 3 -symmetrical and C 2 -symmetrical building blocks. It contains two types of triangular micropores of different sizes and chemical environments: one is 11.3 Å and the other is 15.2 Å. The structure of the dual-pore COF was confirmed by powder X-ray diffraction (PXRD) investigation, nitrogen adsorption–desorption study, and theoretical calculations.
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Xu et al. (2015) studied this question.