| 2-亚胺吡啶镍配合物的合成、晶体结构及催化乙烯聚合 |
| Synthesis, Crystalline Structure and Catalytic Properties Toward Ethylene Polymerization of the 2-Iminopyridine Nickel(Ⅱ) Complex |
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| 摘要: 经过一系列化学反应，在吡啶环上引入特丁基及甲醛基，再与2，6-二异丙基苯胺反应生成2-（N-2，6-二异丙基苯亚氨基）亚甲基-6-特丁基吡啶（g）配体，并合成了相应的配合物[NiBr2（g）]（h）。配合物h的单晶结构表明其为单配体单金属结构，属于正交晶系，a=1.52776（14）nm，b=1.60846（15）nm，c=1.83777（17）nm，晶胞体积4.5160（7）nm3，Z=8。在助催化剂MAO的作用下，考察了催化乙烯聚合特性，在0℃时，所得聚合产物中包括支化聚合物和齐聚物，其中支化聚合物的分子量Mw=1.09×104，其支链大部分为甲基、丁基和长支链，支链密度为58.5。 |
| 关键词: 2-亚胺吡啶镍 晶体结构 聚乙烯（PE） |
| 基金项目: 广东省自然科学基金（S2013010013580）项目资助。 |
| Abstract: Based on a series of chemical reaction, the bulk substituent group tBu and the formyl group are introduced to the pyridine ring, which reacts with 2,6-diisopropylaniline to form the 2-(N-2,6-diisopropylphenylimino) methylene-6-tert-butylpyridine (g) ligand, and then the corresponding [NiBr2(g)] (h) complex is synthesized. From the single-crystal X-ray diffraction analysis, the structure of complex h is the single ligand for the single metal. The h complex crystallizes in orthorhombic with a=1.52776(14) nm, b=1.60846(15) nm, c=1.83777(17) nm, V=4.5160(7) nm3 and Z=8. In the presence of methylaluminoxane (MAO), the catalytic properties as precatalysts for ethylene polymerization is investigated. At 0℃ polymerization temperature, branched polymers as well as short oligomers was simultaneously produced, the Mw of the obtained branched polyethylene is about 1.09×104, in which the branching chains are mainly methyl, butyl and long branching chians with 58.5 branching density (branches/1000C). |
| Keywords: 2-iminopyridine nickel(Ⅱ) crystal structure polyethylene(PE) |
| 投稿时间：2013-06-24 修订日期：2013-11-13 |
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| 黄增芳,瞿晓岳,陈正.2-亚胺吡啶镍配合物的合成、晶体结构及催化乙烯聚合[J].无机化学学报,2014,30(5):1051-1055. |
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