A Novel Phenoxyimine-based Schiff Base Ligand and Its Mononuclear Nickel（II） Complex：Synthesis,Crystal Structure,Norbornene Polymerization and Catalytic Activity

A novel phenoxyimine-based Schiff base ligand and its mononuclear complex [C58H52N2NiO2]（L = 2-benzhydryl-4-dimethoxy-3,5-dimethyl-salicylaldehyde） has been synthesized and characterized by IR spectrum, elemental analysis, TG, WAXD spectra, 1H NMR and 13C NMR. In addition, the molecular structure has been measured by single-crystal X-ray diffraction analysis. The crystal belongs to the monoclinic system, space group P21/c with a = 14.510（6）, b = 18.573（7）, c = 20.961（6） ?, β = 123.453（19）°, V = 4713（3） ?3, Mr = 867.73, Z = 4, Dc = 1.223 g/cm3, μ = 0.456 mm-1, F（000） = 1832, the final R = 0.0685 and wR = 0.1758（I > 2σ（I））. The complex was used as homogeneous catalysis of polymerization of norbornene, and the MAO as cocatalyst. The nickel complex exhibited good catalytic activity up to 1.913 × 107 g of PNB（mol of Ni）-1h-1,and the yields of these reactions depend on the nature of the substituent in the aromatic ring.

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