title: Nickel(II) Complexes Bearing 4-Arylimino-1,2,3-trihydroacridines: Synthesis, Characterization, and Ethylene Oligomerization.
abstract: Nickel(II) complexes have attracted much attention as a new generation of olefin catalysts since the α-diiminonickel complex was discovered as a highly efficient procatalyst for ethylene polymerization. A series of novel 4-arylimino-1,2,3-trihydroacridylnickel(II) dihalide complexes was synthesized in a one-pot reaction of 2,3-dihydroacridine-4-one and different anilines with nickel(II) chloride or nickel(II) bromide 1,2-dimethoxyethane complex. The complexes were characterized by infrared spectroscopy and elemental analysis. The molecular structures of the representative complexes 4-(2,6-diisopropylphenylimino)-1,2,3-trihydroacridylnickel(II) dichloride (C3), 4-(2,4,6-trimethylphenylimino)-1,2,3-trihydroacridylnickel dichloride(II) (C4), and 4-(2,4,6-trimethylphenylimino)-1,2,3-trihydroacridylnickel(II) dibromide (C9) were confirmed by single-crystal X-ray crystallography, revealing a distorted tetrahedral geometry around the nickel(II) of C3 and distorted trigonal bipyramidal geometry for C4 and C9. With the activation of trimethylaluminium (TMA), all nickel(II) complexes exhibited good activity for ethylene oligomerization, and oligomer products ranged from butene (C4) to hexadecene (C16).
authors.affiliation: Chemistry & Environment Science College, Inner Mongolia Normal University, and Key Laboratory of Physics & Chemistry of Functional Materials, Inner Mongolia 81 Zhaowudalu, Huhhot, 010022, P. R. China ; Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry, Chinese Academy of Science Beijing, 100190, P. R. China.
authors.forename: Shengdong
authors.initials: S
authors.lastname: Wang
authors.affiliation: Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry, Chinese Academy of Science Beijing, 100190, P. R. China.
authors.forename: Shizhen
authors.initials: S
authors.lastname: Du
authors.affiliation: Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry, Chinese Academy of Science Beijing, 100190, P. R. China.
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Chemistry & Environment Science College, Inner Mongolia Normal University, and Key Laboratory of Physics & Chemistry of Functional Materials, Inner Mongolia 81 Zhaowudalu, Huhhot, 010022, P. R. China.
authors.forename: Sin
authors.initials: S
authors.lastname: Asuha
authors.affiliation: Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry, Chinese Academy of Science Beijing, 100190, P. R. China.
authors.forename: Wen-Hua
authors.initials: WH
authors.lastname: Sun
keywords: 4-arylimino-1,2,3-trihydroacridines; catalysts; ethylene; nickel(II) complexes; oligomerization