Metal-free coordination of porphyrin-based porous organic polymers for efficient photocatalytic oxidative coupling of amines under visible light

Efficient generation of photogenerated electrons and improvement of superoxide radicals are of great concern for the photocatalytic oxidative coupling of amines under mind conditions. In this work, the vinyl-porphyrins-based porous organic polymer (POP-TSP) by free radical polymerization was prepared. The abundant pore structure of this polymer was favorable for the light capture and mass transfer. As a consequence, POP-TSP exhibited excellent catalytic performances and stability for the oxidative homocoupling of amines to imines under visible light. Meanwhile, the catalyst presented satisfiable substrate compatibility for various primary amines. Superoxide radical anion and singlet oxygen were the main active oxygen species, which was generated from the activation of oxygen by electron transfer and energy transfer, respectively. This work provides a rational guidance for developing efficient porous organic polymers photocatalyst based metal-free coordinated porphyrin.