Cobalt- and ionic liquid-functionalized covalent organic framework for cooperative catalytic CO2 cycloaddition.

A nanofibrous crystalline cobalt(II)-anchored, imine-linked ionic covalent organic framework (Co-Py-COF) with a two-dimensional AA stacking structure was synthesized. This material exhibits outstanding catalytic activity for the cycloaddition of CO₂ under mild reaction conditions (1 atm, cocatalyst-free), attributed to the synergistic interaction between Co(II) ions and pyridinium groups.