Ni(II) and Pd(II) complexes of camphor-derived diazadiene ligands: steric bulk tuning and ethylene polymerization

Nickel(II) and palladium(II) centers were coordinated to a series of chial 1,4-diazadiene ligands. The ligand backbones are camphor derivatives and th e imine nitrogens are attached to independently varied 2- and 2,6-substitut ed aryl groups. Upon activation with methylaluminoxane, the dibromo nickel complexes polymerize ethylene and 1-hexene. The polymerization properties a re dependent on the steric features of the aryl substituents on the imine n itrogens. (C) 1998 Elsevier Science S.A. All rights reserved.