A series of salicylaldimines,synthesized in high yield via microwave-assisted condensation of salicylaldehyde and 2-alkoxyaniline were allowed to react with nickel chloride to form six-coordinated nickel complexes.These nickel complexes were carefully characterized,and the solid structure of la was elucidated by X-Ray diffraction.Activated with MAO,the nickel complexes showed good activity for homopolymerization of norbornene.Reaction parameters,such as the ratio of nickel precursor to MAO,monomer concentration,reaction time and the reaction temperature,as well as the nature of the ligands were found to have significant effects on the catalytic activity and some properties of the resulting polynorbornene.
2,9-Diformyl-1,10-phenanthrolinebis(2,6-dimethylanil)cobalt(II) perchlorate was synthesized and demonstrated to be [CoL2][ClO4]2 by X-ray diffraction analysis. It crystallizes in the monoclinic system, space group C2/c with a = 22.294(4), b = 15.122(3), c = 20.640(4) , β = 119.618(4)°, V = 6048.9(19) 3, C63H52Cl2CoN9O9, Mr = 1208.97, F(000) = 2504, Dc = 1.328g/cm3, Z = 4, μ = 0.436, the final R = 0.0712 and wR = 0.1718 for 1734 observed reflections (I > 2σ(I)). In its solid state the helical polymeric chains are supramolecularly associated through intermolecular and inter- ionic hydrogen bonding interactions.
The title nickel complex (C34H30Cl2N2NiO4, Mr = 660.21) has been synthesized and its crystal structure was determined by single-crystal X-ray structure analysis. It crystallizes in the monoclinic system, space group P21/n with a = 11.026(8), b = 11.491(8), c = 12.119(9) ?, β = 91.328(13)o, Z = 2, V = 1535.0(19) ?3, Dc = 1.428 g/cm3, F(000) = 684 and μ(MoKα) = 0.848 mm～1. The structure was refined to R = 0.0544 for 1813 observed reflections with I > 2σ(I) and wR = 0.0867 for 3132 unique reflections. The molecule of the complex is high symmetrical. Ni(II) atom is located in the symmetric center and coordinated to two phenolic oxygen and two imino nitrogen atoms, forming two six-membered rings. Upon activation with methylaluminoxane (MAO), it is active for ethylene oligomerization.
