2-[1-(2,6-Dibenzhydryl-4-methylphenylimino)ethyl]-6-[1-(arylimino)ethyl] pyridylcobalt(ii) dichlorides: Synthesis, characterization and ethylene polymerization behavior

Yu, Jiangang; Huang, Wei; Wang, Lin; Redshaw, Carl; Sun, Wen Hua

Abstract

A series of unsymmetrical 2,6-bis(imino)pyridylcobalt(ii) complexes, {2-[2,6-(CH(C6H5)2)2-4-Me-C 6H2NC(CH3)]-6-(2,6-R12-4-R2-C6H2NCCH3)-C 5H3NCoCl2} where R1 = Me, Et or iPr, R2 = H or Me, together with the new symmetrical complex 2,6-[2,6-(CH(C6H5)2) 2-4-Me-C6H2NC(CH3)] 2-C5H3NCoCl2, were synthesized. All of the compounds were fully characterized by 1H NMR and IR spectroscopy, as well as by elemental analysis. The molecular structures of Co1 (R1 = Me, R2 = H) and Co5 (R1 = Et, R 2 = Me) were further confirmed by single crystal X-ray diffraction, which indicated that the cobalt centres were penta-coordinate with a pseudo square-pyramidal geometry. Upon treatment with MAO or MMAO, these cobalt pre-catalysts exhibited higher activities than any previously reported cobalt pre-catalysts, with values as high as 4.64 × 106 g PE mol -1(Co) h-1 for ethylene polymerization at atmospheric pressure. The polyethylenes obtained were of high molecular weight and narrow molecular weight distribution. © The Royal Society of Chemistry 2011.

Citation

Yu, J., Huang, W., Wang, L., Redshaw, C., & Sun, W. H. (2011). 2-[1-(2,6-Dibenzhydryl-4-methylphenylimino)ethyl]-6-[1-(arylimino)ethyl] pyridylcobalt(ii) dichlorides: Synthesis, characterization and ethylene polymerization behavior. Dalton Transactions : an international journal of inorganic chemistry, 40(39), 10209-10214. https://doi.org/10.1039/c1dt11062d

• Journal Article Type: Article
• Acceptance Date: Aug 2, 2011
• Online Publication Date: Sep 12, 2011
• Publication Date: Oct 21, 2011
• Deposit Date: Jun 8, 2022
• Journal: Dalton Transactions
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 40
• Issue: 39
• Pages: 10209-10214
• DOI: https://doi.org/10.1039/c1dt11062d
• Public URL: https://hull-repository.worktribe.com/output/3622363