Diversity of Covalent Organic Frameworks (COFs): A 2D COF Containing Two Kinds of Triangular Micropores of Different Sizes

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 angstrom and the other is 15.2 angstrom. The structure of the dual-pore COF was confirmed by powder X-ray diffraction (PXRD) investigation, nitrogen adsorption desorption study, and theoretical calculations.