Homo-polymerization of 1-hexene catalysed by OˆNˆN (Salicylaldimine)iron(III) pre-catalysts to branched poly(1-hexene)

Margaret Yankey, Collins Obuah, James Darkwa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Five new iron(III) 1-hexene polymerisation catalysts were prepared from the reactions of 2,4-di-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L1), or 4-tert-butyl-6-(2-(1H- imidazol-4-yl)ethylimino)methylphenol (L2) or 2,4-di-tert-butyl-6-[(2-pyridin-2-yl-ethylimino)-methyl-phenol (L3) with anhydrous iron(II) halides to form [FeCl2(L1)] (1), [FeBr2(L1)] (2), [FeI2(L1)] (3), [FeBr2(L2)] (4) and [FeCl2(L3)] (5). All the iron(III) complexes 1-5 were activated with EtAlCl2 to produce active catalysts for the polymerisation of 1-hexene to low molecular weight poly(1-hexene) (Mn = 1021-1084 Da) and very narrow polydispersity indices (1.19-1.24).1H and13C{1H} NMR analysis showed the polymers are branched with methyl, butyl and longer chain branches. The longer chain branches are dominant indicating that 2,1-insertion of monomer is favoured over 1,2-insertion in the polymerisation reaction.

Original languageEnglish
Article number47
Issue number3
Publication statusPublished - 17 Mar 2016


  • (Salicylaldimine)iron(III) pre-catalysts
  • 1-hexene polymerization
  • Branched low molecular weight poly(1-hexene)
  • Narrow polydispersity indices

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry


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