Citation: HUANG Zeng-Fang, QU Xiao-Yue, CHEN Zheng. Synthesis, Crystalline Structure and Catalytic Properties Toward Ethylene Polymerization of the 2-Iminopyridine Nickel(Ⅱ) Complex[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(5): 1051-1055. doi: 10.11862/CJIC.2014.113 shu

Synthesis, Crystalline Structure and Catalytic Properties Toward Ethylene Polymerization of the 2-Iminopyridine Nickel(Ⅱ) Complex

1.
College of Chemistry and Biology, Zhongshan Institute, University of Electronic Science & Technology of China, Zhongshan, Guangdong 528402, China

Received Date: 24 June 2013
Available Online: 13 November 2013
Fund Project: 广东省自然科学基金(S2013010013580)项目资助。 (S2013010013580)

Based on a series of chemical reaction, the bulk substituent group ^tBu and the formyl group are introduced to the pyridine ring, which reacts with 2,6-diisopropylaniline to form the 2-(N-2,6-diisopropylphenylimino) methylene-6-tert-butylpyridine (g) ligand, and then the corresponding [NiBr₂(g)] (h) complex is synthesized. From the single-crystal X-ray diffraction analysis, the structure of complex h is the single ligand for the single metal. The h complex crystallizes in orthorhombic with a=1.52776(14) nm, b=1.60846(15) nm, c=1.83777(17) nm, V=4.5160(7) nm³ and Z=8. In the presence of methylaluminoxane (MAO), the catalytic properties as precatalysts for ethylene polymerization is investigated. At 0℃ polymerization temperature, branched polymers as well as short oligomers was simultaneously produced, the Mw of the obtained branched polyethylene is about 1.09×10⁴, in which the branching chains are mainly methyl, butyl and long branching chians with 58.5 branching density (branches/1000C).
- 2-iminopyridine nickel(Ⅱ);crystal structure;polyethylene(PE)
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沈阳化工大学材料科学与工程学院沈阳 110142