Mixed-ligand iminopyrrolato-salicylaldiminato group 4 metal complexes: Optimising catalyst structure for ethylene/propylene copolymerisations - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Organometallic Chemistry Année : 2007

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

Résumé

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.

Domaines

Chimie

Dates et versions

hal-01445060 , version 1 (24-01-2017)

Identifiants

Citer

Lewis M. Broomfield, Yann Sarazin, Joseph A. Wright, David L. Hughes, William Clegg, et al.. Mixed-ligand iminopyrrolato-salicylaldiminato group 4 metal complexes: Optimising catalyst structure for ethylene/propylene copolymerisations. Journal of Organometallic Chemistry, 2007, 692 (21), pp.4603 - 4611. ⟨10.1016/j.jorganchem.2007.04.047⟩. ⟨hal-01445060⟩
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