SalenCo(Ⅲ)Catalyst Collaboratively Catalyzes Carbon Dioxide Cycloaddition with Metal Nanoclusters
Carbon dioxide(CO2)is a new renewable carbon resource,which can be used to prepare polycarbonate and cyclic carbonate by open-loop copolymerization with epoxides.SalenCo(Ⅲ)can effectively destroy the carbon-oxygen bond of propylene oxide(PO).The Manganese-calcium-oxygen clusters are very good at breaking the H-O bond of water molecules,whereas the CO2-PO copolymerization requires the opening of the carbon-oxygen bond.In terms of bond energy,the hydrogen/oxygen bond is much larger than the carbon/oxygen bond,so the Manganese-calcium-oxygen cluster can be used as the catalyst for CO2-PO copolymerization.In this paper,SalenCo(Ⅲ)catalyst was mixed with Mn4-Ca metal nanoclusters,and the catalytic copolymerization of CO2 and PO was studied.The results show that the catalytic efficiency is greatly improved by the synergistic action of[C][(SalenCo(Ⅲ)catalyst]and[M][Mn4-Ca metal nanoclusters].For[CM3],the TON ratio[M](Mn4-Ca metal nanoclusters)increased by nearly 4 times,and the CPC(cyclic carbonate)in the synthesized product accounted for 97.5％.When external light sources with wavelengths of 403 nm and 200 W were introduced,the copolymerization efficiency reached 1299.8 TON and 99.3％CPC.
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