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Biphenyl-bridged 6-(1-aryliminoethyl)-2-iminopyridyl-cobalt complexes: synthesis, characterization and ethylene polymerization behavior

Xing, Qifeng; Zhao, Tong; Du, Shizhen; Yang, Wenhong; Liang, Tongling; Redshaw, Carl; Sun, Wen-Hua


Qifeng Xing

Tong Zhao

Shizhen Du

Wenhong Yang

Tongling Liang

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Professor Carl Redshaw
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Wen-Hua Sun


A series of biphenyl-bridged 6-(1-aryliminoethyl)-2-iminopyridine derivatives reacted with cobalt dichloride in dichloromethane/ethanol to afford the corresponding binuclear cobalt complexes. The cobalt complexes were characterized by FT-IR spectroscopy and elemental analysis, and the structure of a representative complex was confirmed by single-crystal X-ray diffraction. Upon activation with either MAO or MMAO, these cobalt complexes performed with high activities of up to 1.2 × 10⁷ g (mol of Co)⁻¹ h⁻¹ in ethylene polymerization, which represents one of the most active cobalt-based catalytic systems in ethylene reactivity. These biphenyl-bridged bis(imino)pyridylcobalt precatalysts exhibited higher activities than did their mononuclear bis(imino)pyridylcobalt precatalyst counterparts, and more importantly, the binuclear precatalysts revealed a better thermal stability and longer lifetimes. The polyethylenes obtained were characterized by GPC, DSC, and high-temperature NMR spectroscopy and mostly possessed unimodal and highly linear features.

Journal Article Type Article
Publication Date Mar 24, 2014
Journal Organometallics
Print ISSN 0276-7333
Electronic ISSN 1520-6041
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 33
Issue 6
Pages 1382-1388
APA6 Citation Xing, Q., Zhao, T., Du, S., Yang, W., Liang, T., Redshaw, C., & Sun, W. (2014). Biphenyl-bridged 6-(1-aryliminoethyl)-2-iminopyridyl-cobalt complexes: synthesis, characterization and ethylene polymerization behavior. Organometallics, 33(6), 1382-1388. doi:10.1021/om4010884
Keywords Ethylene polymerization; Cobalt complexes
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Copyright Statement ©2015 University of Hull
Additional Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in Organometallics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see


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