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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

Authors

Qifeng Xing

Tong Zhao

Shizhen Du

Wenhong Yang

Tongling Liang

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Wen-Hua Sun



Abstract

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.

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

Journal Article Type Article
Acceptance Date Nov 11, 2013
Online Publication Date Mar 3, 2014
Publication Date Mar 24, 2014
Deposit Date Jul 14, 2015
Publicly Available Date Jul 14, 2015
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
DOI https://doi.org/10.1021/om4010884
Keywords Ethylene polymerization; Cobalt complexes
Public URL https://hull-repository.worktribe.com/output/376391
Publisher URL http://pubs.acs.org/doi/abs/10.1021/om4010884
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 http://dx.doi.org/10.1021/om4010884

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