Synthesis, characterization, and ethylene polymerization behaviors of late-transition metal complexes coordinated with chlorinated bis(arylimino)pyridine ligand

Heng Liu, Feng Wang, Li Liu, Xiang Yu Jia, Wenjie Zheng, Jun Guo, Chun Yu Zhang, Chen Xi Bai, Yan Ming Hu, Xue Quan Zhang

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Abstract

A series of late-transition metal complexes supported with chlorinated bis(arylimino)pyridine ligands [2,6-(ArNCCl)2C5H 3N]MtCl2 (Ar = 2,4,6-Me3C6H 2, Mt = Fe (1a), Co (2a), Ni (3a); Ar = 2,6-iPr 2C6H3, Mt = Fe (1b), Co (2b); Ar = 2,6-Et 2C6H3, Mt = Co (1c), Ni (3c); Ar = 2,6-Me 2C6H3, Mt = Fe (1d), Co (2d); Ar = 4-Cl-2,6-Me2C6H2, Mt = Fe (1e), Co (2e); Ar = 4-Br-2,6-Me2C6H2, Mt = Fe (1f), Co (2f)) were synthesized. At the presence of methylaluminoxane (MAO), Fe(II)- and Co(II)- based complexes were highly active towards ethylene polymerization, affording polymers with bimodal and unimodal molar mass distributions, respectively, while the Ni(II)-based complexes gave no polymer products. Moreover, the obtained polyethylenes were predominately saturated and vinyl-terminated for Fe(II)- and Co(II)-based complexes, respectively. Changing the ligand environment, polymerization parameters also posed a great influence on the catalytic activities and the properties of the resulting polymers.

Original languageEnglish (US)
Pages (from-to)4611-4618
Number of pages8
JournalPolymer
Volume55
Issue number18
DOIs
StatePublished - Sep 2 2014

Keywords

  • Bimodal polyethylene
  • Chlorinated bis(arylimino)pyridine backbone
  • Late-transition metal

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    Liu, H., Wang, F., Liu, L., Jia, X. Y., Zheng, W., Guo, J., Zhang, C. Y., Bai, C. X., Hu, Y. M., & Zhang, X. Q. (2014). Synthesis, characterization, and ethylene polymerization behaviors of late-transition metal complexes coordinated with chlorinated bis(arylimino)pyridine ligand. Polymer, 55(18), 4611-4618. https://doi.org/10.1016/j.polymer.2014.07.015