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Synthesis and structures of mono(β-diiminato) copper complexes and their catalytic performances for homo- and copolymerizations of methyl acrylate

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Abstract

A series of mono(β-diiminato) copper complexes bearing different coordinating anions and with different fluorine substitution patterns on the β-diiminato ligands were synthesized. All of the complexes were characterized by physicochemical and spectroscopic methods, and in addition, the structures of two of them were confirmed by X-ray diffraction. The crystal structures revealed a four-coordinate mode around the copper center in a slightly distorted square planar geometry, with the β-diimine and the carboxyl groups coordinated to give six- and four-membered chelate rings. The conjugation of C=C and C=N in the β-diiminato ligands and the resonance between C–O and C=O in the carboxyl groups resulted in extensive delocalization of electrons and the formation of conjugated N–C–C–C–N and O–C–O π-bonds, respectively. When activated by modified methylaluminoxane (MMAO), these complexes can effectively catalyze methacrylate (MA) polymerization with activities up to 54.5 kg/mol Cu h, as well as MA/1-hexene copolymerization with the incorporation of MA over 80 %.

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Acknowledgments

The authors are grateful for the financial support from the Natural Sciences Foundation of China (21172269). Dr. Q. You is grateful for the financial support from the Applied Fundamental Research Project of Wuhan City (2015011701011598).

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Authors and Affiliations

  1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, South-Central University for Nationalities, Wuhan, Hubei Province, 430074, People’s Republic of China

    Liwei Wang, Xiangqian You, Tingcheng Li, Aiqing Zhang & Guangyong Xie

  2. Key Laboratory of Optoelectronic Chemical Materials and Devices (Jianghan University), Ministry of Education, Wuhan, 430056, People’s Republic of China

    Qingliang You

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  1. Liwei Wang
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  2. Xiangqian You
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  3. Qingliang You
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Correspondence to Guangyong Xie.

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Wang, L., You, X., You, Q. et al. Synthesis and structures of mono(β-diiminato) copper complexes and their catalytic performances for homo- and copolymerizations of methyl acrylate. Transit Met Chem 41, 857–866 (2016). https://doi.org/10.1007/s11243-016-0088-6

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  • DOI: https://doi.org/10.1007/s11243-016-0088-6

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