2-[1-(2,6-Dibenzhydryl-4-chlorophenylimino)ethyl]-6-[1-(arylimino)ethyl]pyridyliron(II) dichlorides:Synthesis, characterization and ethylene polymerization behavior

Cao, Xiaoping, He, Fan, Zhao, Weizhen, Cai, Zhengguo, Hao, Xiang, Shiono, Takeshi, Redshaw, Carl and Sun, Wen-Hua (2012) 2-[1-(2,6-Dibenzhydryl-4-chlorophenylimino)ethyl]-6-[1-(arylimino)ethyl]pyridyliron(II) dichlorides:Synthesis, characterization and ethylene polymerization behavior. Polymer, 53 (9). pp. 1870-1880.

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Abstract

A series of 2-[1-(2,6-dibenzhydryl-4-chlorophenylimino)ethyl]-6-[1-(arylimino)ethyl]pyridine ligands (L1–L5) as well as the ligand 2,6-bis[1-(2,6-dibenzhydryl-4-chloro-phenylimino)ethyl]pyridine (L6) were synthesized and reacted with FeCl2·4H2O to afford the iron(II) dichloride complexes [LFeCl2] (Fe1–Fe6). All new compounds were fully characterized by elemental and spectroscopic analysis, and the molecular structures of the complexes Fe1, Fe2 and Fe4 were determined by single-crystal X-ray diffraction, which revealed a pseudo-square-pyramidal geometry at iron. Upon activation with either MAO or MMAO, all iron pre-catalysts exhibited very high activity in ethylene polymerization with good thermal stability. To the best of our knowledge, the current system showed the highest activity amongst iron bis(imino)pyridine pre-catalysts reported to-date. The polymerization parameters were explored to determine the optimum conditions for catalytic activity, which were typically found to be 2500 eq. Al to Fe at 60 °C in the presence of MMAO, and 80 °C in the presence of MAO. The resultant polyethylene possessed a narrow molecular polydispersity index (PDI) consistent with the formation of single-site active species.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Rhiannon Harvey
Date Deposited: 21 Mar 2012 09:58
Last Modified: 21 Apr 2020 16:18
URI: https://ueaeprints.uea.ac.uk/id/eprint/38370
DOI: 10.1016/j.polymer.2012.02.050

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