Synthesis,Structure and Norbornene Polymerization Activity of a Novel Palladium(Ⅱ) Complex with N,OBis{1-[[(3-methyl-pyridin-2-yl)amino]methyl-phenyl]-2-hydroxy-3,5-di-tert-butylphenol} Ligand

The title complex bis{1-(3-methyl-pyridin-2-yl) amino] methyl-phenyl]-2-hydroxy-3,5-di-tert-butylphenol} palladium(C_(42)H_(56)O_2N_4Pd) has been synthesized by the reaction of 1-(3-methyl-pyridin-2-yl)amino]methyl-phenyl]-2-hydroxy-3,5-di-tert-butylphenol with Pd(OAc)_2, and was characterized by IR and elemental analyses(C, H, N). Single-crystal X-ray diffraction analysis of the complex revealed an almost parallelogram geometry of the metal center, space group P1 with a = 12.3870(13), b = 12.9673(12), c = 14.3998(4) ?, α = 67.53(2), β = 75.34(2), γ = 86.89(3)°, V = 2065.5(3) ?~3, M_r = 773.32, Z = 2, D_c = 1.243 g/cm~3, μ = 0.489 mm~(-1), F(000) = 816, the final R = 0.0649 and wR = 0.1567. The compound was investigated for the catalytic behavior towards norbornene(NB) vinyl addition polymerization. And the complex exhibits high catalytic activities up to 1.668 × 10~7 g of PNB(mol of Pd)~(-1) h~(-1) with high monomer conversion using methylaluminoxane(MAO) as the cocatalyst.