A Stable, Mesoporous Three‐Dimensional Covalent Organic Framework as a Versatile Functional Platform

adsorption capacity, with a change rate reaching 60.4% under UV irradiation-the highest performance reported for any azobenzene-functionalized porous materials. This work establishes a general platform for the synthesis of highly crystalline COFs with pore-wall functionality, unlocking new opportunities in smart adsorption, catalysis, and beyond.