New Half-sandwich Zirconium(IV) Complexes Containing Salicylaldimine Ligands: Synthesis, Characterizations and Catalytic Properties

doi:10.1007/s40242-014-4054-6

Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (5): 825-830.doi: 10.1007/s40242-014-4054-6

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New Half-sandwich Zirconium(IV) Complexes Containing Salicylaldimine Ligands: Synthesis, Characterizations and Catalytic Properties

LIU Kefeng¹, YAO Gang¹, WU Wenlei¹, GAO Bo^2,3

1. Yellow River Dalta Jingbo Research Institute of Chemical Industry, Boxing 256500, P. R. China;
2. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, P. R. China;
3. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China

Received:2014-02-20 Revised:2014-03-28 Online:2014-10-01 Published:2014-05-12
Contact: LIU Kefeng, GAO Bo E-mail:jingboliukf@163.com;gaobo@ciac.ac.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21204082).

Abstract

Abstract:

Two new half-sandwich zirconium(IV) complexes bearing salicylaldimine ligands of the type CpZr[2-^tBu-4-R-6-(CH=NⁱPr)C₆H₂O]Cl₂[R=H(1), ^tBu(2)] were prepared by the reaction of CpZrCl₃ with the corresponding lithium of salicylaldimine ligands 2-^tBu-4-R-6-(CH=NⁱPr)C₆H₂OLi[R=H(LiLa), ^tBu(LiLb)]. Complexes 1 and 2 were characterized by ¹H NMR, ¹³C NMR spectroscopy and elemental analysis. When activated with AlⁱBu₃ and Ph₃CB(C₆F₅)₄, both complexes 1 and 2 exhibited reasonable catalytic activities for ethylene polymerization, producing polyethylenes with moderate molecular weight. Complexes 1 and 2 also exhibited reasonable catalytic activities for ethylene copolymerization with 1-hexene, producing poly(ethylene-co-1-hexene)s with moderate molecular weight and reasonable 1-hexene content.

Key words: Zirconium complex, Metallocene catalyst, Ethylene polymerization, Olefin copolymerization

LIU Kefeng, YAO Gang, WU Wenlei, GAO Bo. New Half-sandwich Zirconium(IV) Complexes Containing Salicylaldimine Ligands: Synthesis, Characterizations and Catalytic Properties[J]. Chemical Research in Chinese Universities, 2014, 30(5): 825-830.

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New Half-sandwich Zirconium(IV) Complexes Containing Salicylaldimine Ligands: Synthesis, Characterizations and Catalytic Properties

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