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

Lookup NU author(s): Emeritus Professor Bill Clegg, Dr Ross Harrington

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Abstract

Treatment of MCl3(OC6H3-2-tBu-6-CH{double bond, long}NC6F5)(THF) (M = Ti, Zr) with a variety of different potassium iminopyrrolate salts (K+[RN{double bond, long}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{double bond, long}NC6F5)(C2H5N{double bond, long}CHC4H3N) (1c), TiCl2(OC6H3-2-tBu-6-CH{double bond, long}NC6F5)(C6H11N{double bond, long}CHC4H3N) (1b) and ZrCl2(OC6H3-2-tBu-6-CH{double bond, long}NC6F5)(C6H11N{double bond, long}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. © 2007 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Broomfield LM, Sarazin Y, Wright JA, Hughes DL, Clegg W, Harrington RW, Bochmann M

Publication type: Article

Publication status: Published

Journal: Journal of Organometallic Chemistry

Year: 2007

Volume: 692

Issue: 21

Pages: 4603-4611

ISSN (print): 0022-328X

ISSN (electronic): 1872-8561

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.jorganchem.2007.04.047

DOI: 10.1016/j.jorganchem.2007.04.047


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