Synthesis, Crystal Structure and Characterization of a Nickel Complex Based on Phenoxyimine Ligand and Catalysis of the Vinyl Polymerization of Norbornene

摘要

The title complex N,O-bis{2-[[(2-benzhydryl-4,6-dimethylphenyl)imino]-methyl]-phenol}-nickel(Ⅱ) (C56H48N2NiO2) has been synthesized by the reaction of 2-[[(2-benzhydryl-4,6-dimethylphenyl)mino]-methyl]-phenol with Ni(CH3COO)2·4H2O,and characterized by elemental analysis and IR spectrum.The spatial structure of the complex has been confirmed by single-crystal X-ray diffraction analysis.The compound belongs to the monoclinic system,space group C2/c with a =39.035(8),b =13.276(3),c =17.679(4) (A),β =98.06(3)°,V =9071(3) (A)3,C56H-48N2NiO2,Mr =839.67,Z =8,Dc =1.230 Mg/m3,μ =0.472 mm-1,F(000) 于 3536,T =293(2) K,the final R =0.0675 and wR =0.1345 (1 ＞ 2σ(1)).The compound showed excellent catalytic activity up to 1.268 × 107 g of PNB (mol of Ni)-1 h-1 for the addition polymerization of norbornene by using methylaluminoxane (MAO) as a cocatalyst.