One-Pot Syntheses of Binary Quinoxaline-linked Covalent Organic Frameworks

Abstract

Developing new linkage chemistry is pivotal for enriching the diversities and functions of covalent organic frameworks (COFs). However, only a limited number of chemical bonds have been successfully employed in the synthesis of new linkage COFs, especially for dual-linkage COF, and the resulting COFs often suffered from low chemical stability owing to the reliance on reversible bond formation. Herein, we report a facile one-pot strategy to synthesize stable binary COFs featuring quinoxaline and imine or amine linkages, formed via an irreversible cycloaromatization reaction and a reversible Schiff’s base reaction, followed by an irreversible Eschweiler-Clarke reaction. The afforded binary quinoxaline-linked COFs exhibited robustness under strong acidic, basic conditions. These COFs demonstrated effective CO2/N2 separation under humid conditions without performance deterioration over multiple cycles.