Copolymerization of ethylene with methyl methacrylate with neutral nickel(II) complexes bearing β-ketoiminato chelate ligands

Xiao Fang Li, Yang Guo Li, Yue Sheng Li*, Yan Xiang Chen, Ning Hai Hu

*此作品的通讯作者

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96 引用 (Scopus)

摘要

New neutral nickel(II) complexes bearing asymmetric β-ketoiminato (N,O) ligands (5a-c), [(2,6-iPr2C6H 3)NC(R2)C(H)C(R1)O]Ni(Ph)(PPh3), have been synthesized. X-ray crystal structures reveal that each of complexes 5a-c adopts a near square-planar coordination geometry and the triphenylphosphine group is always trans to the arylamine group. With modified methylaluminoxane (MMAO) as a cocatalyst, complexes 5a-c can promote the polymerization of methyl methacrylate (MMA) in excellent yields (>98%), producing syndiotactic-rich PMMAs (rr around 70%). It is very exciting that the 5a-c/MMAO catalyst systems exhibit highly catalytic activities for the copolymerization of ethylene with MMA, producing high molecular weight functionalized polyethylenes with up to 16.7 mol % of methacrylate units built into the moderately branched polyethylene backbone. Further mechanistic studies have shown that PMMAs and copolymers obtained using these complexes possibly arise from a coordination-insertion mechanism rather than a radical mechanism.

源语言英语
页(从-至)2502-2510
页数9
期刊Organometallics
24
10
DOI
出版状态已出版 - 9 5月 2005
已对外发布

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Li, X. F., Li, Y. G., Li, Y. S., Chen, Y. X., & Hu, N. H. (2005). Copolymerization of ethylene with methyl methacrylate with neutral nickel(II) complexes bearing β-ketoiminato chelate ligands. Organometallics, 24(10), 2502-2510. https://doi.org/10.1021/om049080w