Synthesis, Crystal Structure and Norbornene Polymerization of a Palladium(Ⅱ) Complex Based on Phenoxyimine Ligand

The title complex N,O-bis{2-[[(2,6-benzhydryl-4-methylphenyl)imino]-methyl]-phenol}-palladium(II)(C_(80)H_(64)N_2O_2 Pd) has been synthesized by the reaction of 2-[[(2,6-benzhydryl-4-methylphenyl)imino]-methyl]-phenol with Pd(CH_3COO)_2, and characterized by IR spectrum and elemental analysis. The spatial structure of the complex has been verified by single-crystal X-ray diffraction analysis. The compound belongs to the monoclinic system, space group P21/n with a = 13.492(3), b = 16.924(3), c = 14.135(3) ?, β = 97.84(3)°, V = 3197.4(11) ?~3, C_(80)H_(64)N_2O_2 Pd, Mr = 1191.73, Z = 2, Dc = 1.238 Mg/m^3, μ = 0.339 mm^(-1), F(000) = 1240, T = 293(2) K, the final R = 0.0593 and wR = 0.1192(I > 2s(I)). The compound showed excellent catalytic activity up to 1.130 × 10~7 g of PNB(mol of Pd)^(-1)h^(-1) for the addition polymerization of norbornene by using methylaluminoxane(MAO) as a cocatalyst.