期刊
INORGANICA CHIMICA ACTA
卷 435, 期 -, 页码 305-312出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2015.07.013
关键词
Pyridine; Oxazoline; Quinoline; Cobalt complex; 1,3-Butadiene polymerization
资金
- National Basic Research Program of China [2015CB654700, 2015CB674702]
- CAS Hundred Talents Program [Y220011001]
- Funds for National Natural Scientific Foundation of China [51473156, 51203147]
- Jilin Provincial Research Fund for Basic Research, China [20130102007JC]
A series of cobalt complexes supported by pyridine-oxazoline (Pyox) and quinoline-oxazoline (Quox) were synthesized. Determined by single crystal X-ray crystallography, complexes 6a and 7c adopted distorted octahedron and trigonal bipyramid geometries, respectively, while complex 6b existed as an ion pair comprised of [CoL2](2+) and [CoCl4](2-), in which the cationic and anionic moieties displayed distorted octahedron and tetrahedral geometries, respectively. Upon activation with ethylaluminium sesquichloride (EASC), these cobalt complexes exhibited high catalytic activity and cis-1,4-selectivity toward 1,3-butadiene polymerization. The selectivity of the catalytic system could be switched from cis-1,4 to 1,2-fashion via the addition of PPh3. The effects of ligand environment, polymerization temperature, and [Al]/[Co] ratio on the polymerization were investigated in detail. (C) 2015 Elsevier B.V. All rights reserved.
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