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Issue 39, 2012
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Ethylene polymerization by 2-iminopyridylnickel halide complexes: synthesis, characterization and catalytic influence of the benzhydryl group

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Abstract

A series of 2-(2-benzhydrylbenzenamino)pyridine ligands (L1–L13) was synthesized and used as bidentate N^N ligands with nickel halides to afford the corresponding nickel dihalide complexes L2Ni2Cl4C1–C13 and L2NiBr2D1–D13. All ligands and complexes were characterized by IR and NMR spectroscopy, and by elemental analysis. The molecular structures of the representative complexes C1·2CH3OH, C5·2H2O, D4, D7 and D9 were confirmed by single-crystal X-ray diffraction studies. Upon activation with either methylaluminoxane (MAO) or ethylaluminium sesquichloride (Et3Al2Cl3, EASC), these nickel pre-catalysts exhibited high activities (up to the range of 107 g mol−1 (Ni) h−1) towards ethylene polymerization, producing branched polyethylenes with narrow polydispersity.

Graphical abstract: Ethylene polymerization by 2-iminopyridylnickel halide complexes: synthesis, characterization and catalytic influence of the benzhydryl group

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Publication details

The article was received on 07 May 2012, accepted on 07 Aug 2012 and first published on 08 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT30989K
Citation: Dalton Trans., 2012,41, 11999-12010
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    Ethylene polymerization by 2-iminopyridylnickel halide complexes: synthesis, characterization and catalytic influence of the benzhydryl group

    W. Sun, S. Song, B. Li, C. Redshaw, X. Hao, Y. Li and F. Wang, Dalton Trans., 2012, 41, 11999
    DOI: 10.1039/C2DT30989K

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