The field of Covalent Organic Frameworks (COFs) – crystalline and porous polymers that are solely consisting of organic building blocks reticulated via covalent bonds – have gained increasing attention in the last decade. COFs feature high porosity, structural tunability and the possibility to integrate functional linkers in the COF backbone and have therefore emerged as a promising materials for many applications including gas storage & separation, energy storage and catalysis. Furthermore, due to their conjugated backbone, COFs have been applied as photocatalysts for H2O and CO2 conversion, however only few examples of COFs have been used to catalyze organic transformations. Herein, we report the synthesis of a new family of porous and crystalline COFs using an acridine linker and benzene-1,3,5-tricarbaldehyde derivatives bearing a variable number of hydroxy groups. With the broad absorption in the visible light region the COFs were applied as photocatalysts in metallaphotocatalytic C–N cross coupling. The materials showed good to excellent yields for several substrates and even catalyzed the organic transformation using green light as energy source.

Acridine-functionalized covalent organic frameworks (COFs) as photocatalysts for metallaphotocatalytic C–N cross-coupling

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ACS Fall 2022

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