title: Synthesis and characterization of 2-(2-benzhydrylnaphthyliminomethyl)pyridylnickel halides: formation of branched polyethylene.
abstract: 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.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China. caoxplzu@163.com.
authors.forename: Erlin
authors.initials: E
authors.lastname: Yue
authors.forename: Qifeng
authors.initials: Q
authors.lastname: Xing
authors.forename: Liping
authors.initials: L
authors.lastname: Zhang
authors.forename: Qisong
authors.initials: Q
authors.lastname: Shi
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Cao
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Carl
authors.initials: C
authors.lastname: Redshaw
authors.forename: Wen-Hua
authors.initials: WH
authors.lastname: Sun