A2B2-zinc(II)porphyrin/divinylbenzene Copolymer as Efficiently Bifunctional Catalyst for Cycloaddition of CO2 with Epoxides

Graphical The A 2 B 2 -type Zn-porphyrin containing vinyl and imidazolium groups was utilized for copolymerization with divinylbenzene to prepare metalloporphyrin-based porous organic polymers. Due to the high specific surface area and the coexistence of Zn 2+ and I − , the as-prepared ZnPorI 2 /nDVB exhibited excellent catalytic activity and stability for the cycloaddition of CO 2 and epoxides. In this work, the A 2 B 2 -type Zn-porphyrin (ZnPorI 2 ) featuring vinyl and imidazolium groups was utilized to prepare porous organic polymers (POPs). The vinyl group served as the linking unit for copolymerization with rigid divinylbenzene (DVB). The imidazolium group introduced iodide ions (I − ) into ZnPorI 2 /nDVB (n=30, 50) as Lewis base. By fine-tuning the ZnPorI 2 to DVB ratio, it is possible to optimize the porosity, morphology, and content of Zn-porphyrin. Owing to the synergistic effect of Zn 2+ and I − , the as-prepared ZnPorI 2 /30DVB exhibited excellent catalytic activities in the cycloaddition of carbon dioxide with epoxides.