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中文摘要：
unsymmetric 先锋乙醇 6-acetylpyridine-2-carboxylate (4 ) 从 2,6-dimethylpyridine (1 ) 被综合。根据这位先锋，一新单音(imino ) pyridine ligand (5 ) 和相应公司(II ) 复杂 {2-carbethoxy-6-[1-[(2,6-diethylphenyl ) imino ] 乙醇] pyridine } CoCl2 (6 ) 被准备。建筑群的水晶结构显示 2-carbethoxy-6-iminopyridine 作为有三齿的 ligand 被协调到钴用[ N ， N ， O ]原子，和中央钴的协作几何学是弄歪的三角的 bipyramid ，与 pyridyl 氮原子和形成赤道的飞机的二个氯原子。被用于乙烯 oligomerization，这钴建筑群显示出 1.820 瑮敨楳s 的催化活动吗？？
英文摘要：
The unsymmetric precursor ethyl 6-acetylpyridine-2-carboxylate （4） was synthesized from 2,6-dimethylpyridine （1）. On the basis of this precursor, a new mono（imino）pyridine ligand （5） and the corresponding Co（Ⅱ） complex {2-carbethoxy-6-[1-[（2,6-diethylphenyl）imino]ethyl]pyridine}CoCl2 （6） were prepared. The crystal structure of complex indicates that the 2-carbethoxy-6-iminopyridine is coordinated to the cobalt as a tridentate ligand using [N, N, O] atoms, and the coordination geometry of the central cobalt is a distorted trigonal bipyramid, with the pyridyl nitrogen atom and the two chlorine atoms forming the equatorial plane. Being applied to the ethylene oligomedzation, this cobalt complex shows catalytic activity of 1.820× 10^4 g/mol-Cooh at 101325 Pa of ethylene at 15.5℃ for 1 h, when 1000 equiv, of methylaluminoxane （MAO） is employed as the cocatalyst.
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