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Citation: HAN Chao, LIU Heng, YANG Feng, HU Yanming, ZHANG Xuequan. Pyrazolylimine Ni (Ⅱ) Complexes:Synthesis,Characterization,and Catalytic Behaviors for 1,3-Butadiene Polymerization[J]. Chinese Journal of Applied Chemistry, ;2015, 32(8): 909-915. doi: 10.11944/j.issn.1000-0518.2015.08.140425 shu

Pyrazolylimine Ni (Ⅱ) Complexes:Synthesis,Characterization,and Catalytic Behaviors for 1,3-Butadiene Polymerization

HAN Chao ^a ,
LIU Heng ^b ,
YANG Feng ^a,, ,
HU Yanming ^b ,
ZHANG Xuequan ^b,,

1.
a School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;
2.
b Key Laboratory of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: YANG Feng, ZHANG Xuequan,
Received Date: 12 December 2014
Available Online: 19 January 2015
Fund Project: 国家自然科学基金青年科学基金项目(51203092)资助项目 (51203092)

A series of NN-bidentate nickel (Ⅱ) complexes bearing pyrazolylimine ligands (4a~4e) was synthesized and characterized by FTIR and elemental analysis.Determined by X-ray single crystal diffraction,complex 4b adopted distorted trigonal bipyramidal geometry around the central metal.Activated by ethylaluminum sesquichloride (EASC),all complexes exhibited high cis-1,4 selectivity towards 1,3-butadiene polymerization to afford liquid polybutadienes (PB) with relative molecular mass of 4500~9000 and 91% cis-1,4 content.The catalytic activity of the complex decreased as the hindrance of the substituent on the ligand increased.The effects of Al/Ni molar ratio and polymerization temperature on the polymerization were further investigated in details.The catalytic activity increased with the increase of polymerization temperature from20℃ to 60℃,and the polymer yield only slightly decreased even at a high temperature of 80℃,indicating high thermal stability of the active species generated by the present catalytic system.
- pyrazolylimine,
- nickle complex,
- liquid polybutadiene,
- coordination polymerization
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Pyrazolylimine Ni (Ⅱ) Complexes:Synthesis,Characterization,and Catalytic Behaviors for 1,3-Butadiene Polymerization

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com