Synthesis, structure, and catalytic ethylene oligomerization of nickel complexes bearing 2-pyrazolyl substituted 1,10-phenanthroline ligands

Yue Yang, Peiju Yang, Cui Zhang, Gang Li, Xiao Juan Yang, Biao Wu*, Christoph Janiak

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

38 引用 (Scopus)

摘要

A series of nickel(II) halide complexes [NiCl2(L)] (1a-12a) and [NiBr2(L)] (1b-12b) bearing 2-pyrazolyl substituted 1,10-phenanthroline derivatives (L1-L12) have been synthesized and characterized by elemental analysis, IR spectroscopy and X-ray diffraction analysis (for 1a′, 10b and 12b). Upon activation with methylaluminoxane (MAO), these complexes display good catalytic activities in ethylene oligomerization (up to 3.01 × 105 g mol(Ni)-1 h-1 at 10 atm of ethylene for 12a with L12 = 2-(3,5-diphenylpyrazol-1-yl)-9-mesityl-1,10-phenanthroline). Complexes with bulkier aryl groups in the 9-position of the phenanthroline ring and the 3- and 5-position of the pyrazolyl ring give higher activities. This is explained with the formation of a more directional environment, a reaction channel around the nickel center which enhances the probability of insertion over dissociation after ethylene coordination to Ni. Also, bulkier aryl substituents can suppress chain-transfer reactions (typically β-H elimination) and therefore increase the activity.

源语言英语
页(从-至)9-17
页数9
期刊Journal of Molecular Catalysis A: Chemical
296
1-2
DOI
出版状态已出版 - 10 12月 2008
已对外发布

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Yang, Y., Yang, P., Zhang, C., Li, G., Yang, X. J., Wu, B., & Janiak, C. (2008). Synthesis, structure, and catalytic ethylene oligomerization of nickel complexes bearing 2-pyrazolyl substituted 1,10-phenanthroline ligands. Journal of Molecular Catalysis A: Chemical, 296(1-2), 9-17. https://doi.org/10.1016/j.molcata.2008.08.015