Alternating copolymerization of carbon dioxide and propylene oxide by single-component cobalt salen complexes with various axial group |
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Authors: | Binyuan Liu Xin Zhao Yanhao Gao Xianhong Wang |
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Affiliation: | a Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, China b State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China |
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Abstract: | A series of single-component cobalt salen complexes, N,N′-bis(salicylidene)-1,2phenylenediamino cobaltIII X (X = Cl (1a), Br (1b), NO3 (1c), CF3COO (1d), BF4 (1e), and N3 (1f)) (SalphCoX), were prepared for alternating copolymerization of carbon dioxide and propylene oxide(PO) under mild condition. The axial anion X group of the SalenphCoX played important role in tailoring the catalytic activity, polymeric/cyclic carbonate selectivity, as well as stereochemistry of carbonate unit sequence in the polymer chain. SalenphCoX with an electron-withdrawing axial X group (complex 1c) was an ideal catalyst for the copolymerization of CO2 and PO to selectively produce polycarbonate with ∼99% carbonate linkage and over 81% head-to-tail structure. |
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Keywords: | Carbon dioxide Propylene oxide Copolymerization |
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