Incorporation of Ir(CN)₂(NN)-NiCl₂ in a (NN)-covalent organic framework for transcendent dual catalysis in photochemical cross-coupling synthesis

A quinoline-based covalent organic framework (N<^>N)-Q-COF was constructed with chemically stable networks and (N<^>N)-sites. Its coordination bond with Ir(C<^>N)(2)(N<^>N) units generated new entities with exciting photophysical properties; particularly, the incorporation of a coumarin ligand greatly elevated its properties to a higher level. The further anchoring of NiCl2 produced structures merging both photoredox and organometallic catalysts, resulting in excellent photocatalytic activities in C-S and C-N cross-coupling synthesis. The organic integration of Ir(C<^>N)(2)(N<^>N), NiCl2, and COFs and the advantages of COF networks were responsible for this transcendent dual catalysis. The chemical stability of Q-COFs and the coordination anchoring of Ir(C<^>N)(2)(N<^>N) and NiCl2 enabled its recycling and reuse with no reduction in catalytic performance.