TY - JOUR
T1 - Pyridine-oxazoline and quinoline-oxazoline ligated cobalt complexes
T2 - Synthesis, characterization, and 1,3-butadiene polymerization behaviors
AU - Guo, Jun
AU - Liu, Heng
AU - Bi, Jifu
AU - Zhang, Chunyu
AU - Zhang, Hexin
AU - Bai, Chenxi
AU - Hu, Yanming
AU - Zhang, Xuequan
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/7/30
Y1 - 2015/7/30
N2 - 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.
AB - 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.
KW - 1,3-Butadiene polymerization
KW - Cobalt complex
KW - Oxazoline
KW - Pyridine
KW - Quinoline
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U2 - 10.1016/j.ica.2015.07.013
DO - 10.1016/j.ica.2015.07.013
M3 - Article
AN - SCOPUS:84938321622
SN - 0020-1693
VL - 435
SP - 305
EP - 312
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
ER -