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

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.-H. (2014). Biphenyl-bridged 6-(1-aryliminoethyl)-2-iminopyridyl-cobalt complexes: synthesis, characterization and ethylene polymerization behavior. Organometallics, 33(6), 1382-1388. https://doi.org/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
• 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
• 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
• Contract Date: Jul 14, 2015