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An α-Diimine-Nickel(II) catalyst bearing an electron-withdrawing substituent for olefin polymerization

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Abstract

A Br-substituted α-diimine ligand, bis[N,N′-(4-bromo-2,6-dimethylphenyl)imino]-2,3-butadiene L1, and its corresponding Ni(II) complex, {bis[N,N′-(4-bromo-2,6-dimethylphenyl)imino]-2,3-butadiene} dibromonicke [NiBr 2 (L1)], have been synthesized and characterized. The crystal structure of the free ligand (L1) was determined by X-ray crystallography. Two α-diimine-Ni(II) catalysts, {bis[N,N′-(2,4,6-dimethylphenyl)imino]-2,3-butanedione} dibromonickel [NiBr 2 (L2)] and {bis[N,N′-(2,6-dimethylphenyl)imino]-2,3-butanedione} dibromonickel [NiBr 2 (L3)], were also synthesized and characterized for comparison. The complex [NiBr 2 (L1)], when activated by diethylaluminum chloride, produces the most active catalytic system for the polymerization of ethylene among the three complexes. NMR analysis shows that the degree of branching of polyethylene increases in the presence of electron-withdrawing groups under the same reaction conditions.

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Acknowledgments

The research was financially supported by NSFC (20964003). We also thank Key Laboratory of Eco-Environment-Related Polymer Materials (Northwest Normal University), Ministry of Education, for financial support.

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Authors and Affiliations

  1. Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

    Jianchao Yuan, Xuehu Wang, Tongjian Mei, Yufeng Liu, Chengping Miao & Xiaoli Xie

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  1. Jianchao Yuan
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  2. Xuehu Wang
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  3. Tongjian Mei
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  4. Yufeng Liu
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  6. Xiaoli Xie
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Correspondence to Jianchao Yuan.

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Yuan, J., Wang, X., Mei, T. et al. An α-Diimine-Nickel(II) catalyst bearing an electron-withdrawing substituent for olefin polymerization. Transition Met Chem 36, 433–439 (2011). https://doi.org/10.1007/s11243-011-9487-x

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