Highly efficient azide-alkyne cycloaddition over CuI-modified covalent triazine frameworks in water

Abstract

The synthesis of novel porous polymeric materials with active coordinating motifs is one of the most interesting topics in the field of heterogeneous catalysis and materials chemistry. This study adopts a post-modification strategy to construct three CuI-modified covalent triazine frameworks with different micropores. Bipyridine coordination sites are formed in the porous polymeric structures when the monomers are polymerized into covalent triazine frameworks. Cuprous iodide is uploaded into the skeleton via Cu–N/Cu–I cooperative coordination and forms a metal catalytic site. Furthermore, the uniformly anchored [(N^N) CuI] metal catalytic site donates CTFs to catalyze the azide-alkyne cycloaddition reaction in an aqueous solution, with high efficiency, excellent tolerance (>70% isolated yield for seven examples), and good recyclability, at room temperature.