Cis-1,4 Selective Polymerization of 1,3-Butadiene Catalyzed by Cobalt Complexes Bearing 2-(1-Aryliminomethylene)quinolines

doi:10.3724/SP.J.1095.2013.30133

Chinese Journal of Applied Chemistry

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Cis-1,4 Selective Polymerization of 1,3-Butadiene Catalyzed by Cobalt Complexes Bearing 2-(1-Aryliminomethylene)quinolines

JIA Xiangyu^1,2, LIU Heng^1,2, ZHANG Xuequan^1*

(1.Research Center of High Performance Synthetic Rubber,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;
2.University of Chinese Academy of Sciences,Beijing 100049,China)

Received:2013-03-15 Revised:2013-05-03 Published:2014-02-10 Online:2014-02-10
Contact: zhang

Abstract

Abstract: A series of cobalt(Ⅱ) complexes bearing 2-(1-aryliminomethylene)quinolines was synthesized and characterized. The structures of complexes 2a, 3a and 4a were further analyzed by X-ray crystallography. Complexes 2a and 3a crystallize in the form of mononuclear four-coordination mode(two nitrogen and two chlorine atoms), whereas complex 4a crystallizes as a centrosymmetric binuclear mode due to the less steric hindrance of the substituent on the ligand. Upon activation with ethylaluminum sesquichloride(EASC), polybutadienes with cis-1,4 content up to 98% could be produced using these complex as catalyst. Catalytic activity increases with the electronic effect of the substituent enhancing, while it decreases with the increase of the steric hindrance. The polybutadienes obtained by using [2-(1-aryliminomethylene)quinolines]cobalt/EASC catalyst have relatively high molecular mass(Mn ~2.0×105) and relatively narrow molecular mass distributions(Mw/Mn＜2.7).

Key words: cobalt(Ⅱ) complexes, butadiene, polybutadiene, polymerization

CLC Number:

O631.5

JIA Xiangyu1,2, LIU Heng1,2, ZHANG Xuequan1*. Cis-1,4 Selective Polymerization of 1,3-Butadiene Catalyzed by Cobalt Complexes Bearing 2-(1-Aryliminomethylene)quinolines[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2013.30133.

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Cis-1,4 Selective Polymerization of 1,3-Butadiene Catalyzed by Cobalt Complexes Bearing 2-(1-Aryliminomethylene)quinolines

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