Multinuclear cobalt–salen complexes with phenylene linker for epoxide polymerizations |
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| Authors: | Yo Hiranoi Miho Hatanaka Koji Nakano |
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| Institution: | 1. Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184‐8588, Japan;2. Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashiosaka, Osaka 577‐8502, Japan |
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| Abstract: | Di‐ and trinuclear cobalt (Co)–salen complexes with a benzene ring as a rigid linker were explored for epoxide polymerizations. The dinuclear Co–salen complex with a 1,2‐phenylene linker showed higher catalytic activity than the dinuclear Co–salen complex with a 1,3‐phenylene linker and the trinuclear Co–salen complex with a 1,3,5‐benzenetriyl linker for the copolymerization of propylene oxide (PO) with carbon dioxide. A combination of the absolute configuration of the two Co–salen moieties was found to affect its catalytic activity. The optimized dinuclear Co–salen complex with a heterochiral combination demonstrated highest activity and maintained its catalytic activity under a low catalyst concentration. The heterochiral dinuclear Co–salen complex also showed high activity for the copolymerization of PO with cyclic anhydride. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 2150–2159 |
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| Keywords: | carbon dioxide catalysts copolymerization cyclic anhydride epoxide polycarbonates polyesters |
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