Zinc(II)porphyrin-Based Porous Ionic Polymers (PIPs) as Multifunctional Heterogeneous Catalysts for the Conversion of CO2 to Cyclic Carbonates

:the heterogeneous and multifunctional charged polymers havebroad application prospects in modern catalysis. One of the valid methods ofsynthesizing multifunctional charged polymers is incorporating metalloporphyr-ins with halide anions. Herein, a series of zinc(II)porphyrin-based porous ionicpolymers [PIP-ZnTIPP/DVB (1:m)(m= 20, 40, 60, 80)] were synthesized bycombining imidazolium-functionalized Zn-porphyrin (ZnTIPP) and divinylben-zene (DVB) through the free-radical copolymerization by a solvothermalmethod. The rigid PIPs have many physical advantages such as spatial separationof Zn-porphyrin sites, high thermal stability, hierarchical pore structures, highspecific surface area, and abundant imidazolium (Br-) group in the polymericskeletons, which exhibit fantastic catalytic activity for the coupling reaction ofepoxides and CO2without any solvent or cocatalyst. In particular, the catalystPIP-ZnTIPP/DVB (1:20) displayed the highest catalytic activity with a yield of99% and a turnover frequency (TOF) of 759 h-1and could be recycled six times without the loss of activity. The excellent catalyticactivity results from a synergistic effect between zinc sites and nucleophilic bromide anions.