Dinickel complexes supported by a terphenyl ligand with two phenoxyiminato binding sites and a fully substituted central arene were synthesized. The syn and anti atropisomers of the ligand precursor were isolated and kinetic studies indicate that no appreciable interconversion occurs at the temperatures used for polymerization. The dinickel complexes are active for ethylene polymerization (TOF up to 3700 (mol C2H4)x(mol Ni)-1xh-1) and ethylene/a-olefin copolymerization. Ethylene polymerizations in the presence of amines with the syn atropisomer exhibit up to ~250 times less inhibition than the polymerizations with the anti atropisomer. Comparisons to terphenyl mononickel phenoxyiminato systems indicate that the proximity of the two metal centers in the syn atropisomer leads to the observed inhibitory effect on the deactivation of the catalysts.

Ethylene polymerizations with dinickel phenoxyiminato complexes: Dinuclear effects on inhibition by amines

243rd National Meeting (2012)

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