State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
Dalton Trans. 2014 Feb 28;43(8):3339-46. doi: 10.1039/c3dt53205d.
A series of 2-(2-benzhydrylnaphthyliminomethyl)pyridine derivatives (L1-L3) was prepared and used to synthesize the corresponding bis-ligated nickel(II) halide complexes (Ni1-Ni6) in good yield. The molecular structures of representative complexes, namely the bromide Ni3 and the chloride complex Ni6, were confirmed by single crystal X-ray diffraction, and revealed a distorted octahedral geometry at nickel. Upon activation with either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), all nickel complex pre-catalysts exhibited high activities (up to 2.02 × 10(7) g(PE) mol(-1)(Ni) h(-1)) towards ethylene polymerization, producing branched polyethylene of low molecular weight and narrow polydispersity. The influence of the reaction parameters and the nature of the ligands on the catalytic behavior of the title nickel complexes were investigated.
一系列 2-(2-二苯并基萘亚基甲胺基)吡啶衍生物（L1-L3）被制备并用于合成相应的双配体镍（II）卤化物配合物（Ni1-Ni6），产率良好。通过单晶 X 射线衍射确认了代表性配合物，即溴化物 Ni3 和氯化物配合物 Ni6 的分子结构，表明镍的配位几何形状为扭曲的八面体。用甲基铝氧烷（MAO）或改性甲基铝氧烷（MMAO）活化后，所有镍配合物前催化剂都对乙烯聚合表现出高活性（高达 2.02×10(7)g(PE)mol(-1)(Ni)h(-1)），得到低分子量和窄分子量分布的支化聚乙烯。研究了反应参数和配体性质对标题镍配合物催化行为的影响。
