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Yuan, Shi‐Fang; Fan, Zhe; Zhang, Qiuyue; Flisak, Zygmunt; Ma, Yanping; Sun, Yang; Sun, Wen‐Hua
Applied organometallic chemistry, June 2020, 2020-06-00, 20200601, Letnik: 34, Številka: 6Journal Article
High activities in ethylene polymerization predetermine α‐diiminonickel precatalysts for potential industrial applications. In our study, we have synthesized and characterized a series of unsymmetrical 1‐(2,4‐bis(4,4′‐dimethoxybenzhydryl)‐6‐MeC6H2N)‐2‐arylimino‐acenaphthylene nickel(II) halides. The single‐crystal X‐ray diffraction study of representative compounds reveals distorted tetrahedral geometry. On activation with either Me2AlCl or modified methylaluminoxane, these nickel complexes exhibit high activities of the order of 106 g of PE (mol of Ni)−1 h−1 and produce polyethylene of generic application characterized by high molecular weight, narrow molecular weight distribution, and moderate degree of branching. The substituents at the ligands affect the catalytic performance of the nickel complexes and tune the microstructure of the resultant polyethylene. The synthesis and the catalytic performance of α‐diimine‐Ni precatalyst appended with (p‐MeOPh)2CH groups are disclosed; notably high activities up to 8.61 × 106 g (PE) mol (Ni)−1 h−1 with Ni1/Me2AlCl were obtained.
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