Mixed-ligand iminopyrrolato-salicylaldiminato group 4 metal complexes: Optimising catalyst structure for ethylene/propylene copolymerisations.

Broomfield, LM, Sarazin, Y, Wright, JA, Hughes, DL, Clegg, W, Harrington, RW and Bochmann, M (2007) Mixed-ligand iminopyrrolato-salicylaldiminato group 4 metal complexes: Optimising catalyst structure for ethylene/propylene copolymerisations. Journal of Organometallic Chemistry, 692 (21). pp. 4603-4611.

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Abstract

Treatment of MCl3(OC6H3-2-tBu-6-CH==NC6F5)(THF) (M = Ti, Zr) with a variety of different potassium iminopyrrolate salts (K+[RN==CHC4H3N]-), (R = phenyl, cyclo-hexyl, ethyl) afforded the corresponding titanium and zirconium mixed-ligand complexes MCl2(N–O)(N–N). The molecular structures of TiCl2(OC6H3-2-tBu-6-CH==NC6F5)(C2H5N==CHC4H3N) (1c), TiCl2(OC6H3-2-tBu-6-CH==NC6F5)(C6H11N==CHC4H3N) (1b) and ZrCl2(OC6H3-2-tBu-6-CH==NC6F5)(C6H11N==CHC4H3N) (2b) show distorted octahedral geometries with trans-O-,N-/cis-Cl2 arrangements. On activation with MAO the titanium (iminopyrrolato)(salicylaldiminato) complexes show excellent activities in ethylene polymerisation and are significantly more effective ethylene/propylene copolymerisation catalysts, both in terms of activity and propene incorporation, than either of the parent complexes. The ethylene–propylene copolymers show ca. 80% 1,2 regioselectivity and at high propylene incorporation tend towards an alternating structure.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: Rachel Smith
Date Deposited: 02 Nov 2010 17:48
Last Modified: 21 Apr 2020 19:14
URI: https://ueaeprints.uea.ac.uk/id/eprint/10538
DOI: 10.1016/j.jorganchem.2007.04.047

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