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Nickel(II)-α-diimine complexes containing naphthyl substituents for ethylene polymerization under low ethylene pressure

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Abstract

Two new α-diimine containing Ni(II) complexes, {bis[N,N′-(2,6-dimethyl-4-naphthylphenyl)imino]-1,2-dimethylethane}dibromonickel 3a and {bis[N,N′-(2-methyl-4-naphthylphenyl)imino]-1,2-dimethylethane}dibromonickel 3b were synthesized and characterized. The crystal structures of representative ligand 2a and its complex 3a were determined by X-ray crystallography. Complex 3a bearing 2,6-dimethyl and 4-naphthyl groups, activated by diethylaluminum chloride (DEAC), shows high catalytic activity for the polymerization of ethylene [4.43 × 106 g PE/(mol Ni h bar)]. Interestingly, complexes 3a and 3b bearing the naphthyl substituent in the para-aryl position produced dendritic polyethylenes (branching degree, 3a: 112, 118, and 147; 3b: 113, 127, and 151 branches/1,000 C at 20, 40, and 60 °C, respectively). The dendritic polyethylene particle size obtained by 3a and 3b/DEAC can be controlled in the 1–20 nm range under low ethylene pressure (diameter, 3a: 18.31, 14.44, and 11.09; 3b: 12.29, 8.98 and 6.27 nm at 20, 40, and 60 °C, respectively) and could be expected to produce a nano-targeted drug carrier after modification with water-soluble oligo(ethylene glycol).

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Acknowledgments

We thank the National Natural Science Foundation of China (20964003), Chinese Ministry of Education Returned Overseas Students Scientific Research Foundation (2009-1341), and Chinese Ministry of Human Resources and Social Security Overseas Students Science and Technology Activities Merit-based Foundation (2009-416) for funding.

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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, Zong Jia, Jing Li, Fengying Song, Fuzhou Wang & Bingnian Yuan

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  1. Jianchao Yuan
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  2. Zong Jia
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  3. Jing Li
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  4. Fengying Song
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Correspondence to Jianchao Yuan.

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Yuan, J., Jia, Z., Li, J. et al. Nickel(II)-α-diimine complexes containing naphthyl substituents for ethylene polymerization under low ethylene pressure. Transition Met Chem 38, 341–350 (2013). https://doi.org/10.1007/s11243-013-9699-3

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