Synthesis, Characterization, and Ethylene Oligomerization of Nickel Complexes Bearing N-((Pyridin-2-yl)methylene)quinolin-8-amine Derivatives

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• 作者：Wen-Hua Sun ; Kefeng Wang ; Katrin Wedeking ; Dongheng Zhang ; Shu Zhang ; Jingjing Cai ; Yan Li
• 刊名：Organometallics
• 出版年：2007
• 出版时间：September 10, 2007
• 年：2007
• 卷：26
• 期：19
• 页码：4781 - 4790
• 全文大小：157K
• 年卷期：v.26,no.19(September 10, 2007)
• ISSN：1520-6041

文摘

A series of nickel complexes ligated by N-((pyridin-2-yl)methylene)quinolin-8-amine derivatives weresynthesized by one-pot reaction of 8-aminoquinolines, 1-(pyridine-2-yl) ketones, and nickel halides andcharacterized by elemental and spectroscopic analyses along with X-ray diffraction analyses. These nickelcomplexes exhibit two kinds of structures, namely, dimeric with octahedral-coordinated geometry andmonomeric with distorted trigonal-bipyramidal geometry, in their solid states. Activated by Et₂AlCl,these Ni(II) complexes exhibited good to high catalytic activities for ethylene oligomerization, and activityup to 4.9 × 10⁷ g mol^-1(Ni) h^-1 was observed in the catalytic system with Cy₃P as auxiliary ligand. Thesteric and electronic influence of the substituents as well as the influence of different catalytic conditionswas carefully investigated. In particular, the correlations between reactivity and auxiliary R₃P ligandswere examined.