Pyridine-oxazoline and quinoline-oxazoline ligated cobalt complexes: Synthesis, characterization, and 1,3-butadiene polymerization behaviors

Jun Guo; Heng Liu; Jifu Bi; Chunyu Zhang; Hexin Zhang; Chenxi Bai; Yanming Hu; Xuequan Zhang

doi:10.1016/j.ica.2015.07.013

Pyridine-oxazoline and quinoline-oxazoline ligated cobalt complexes: Synthesis, characterization, and 1,3-butadiene polymerization behaviors

Jun Guo, Heng Liu, Jifu Bi, Chunyu Zhang, Hexin Zhang, Chenxi Bai, Yanming Hu, Xuequan Zhang

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	305-312
Number of pages	8
Journal	Inorganica Chimica Acta
Volume	435
DOIs	https://doi.org/10.1016/j.ica.2015.07.013
State	Published - Jul 30 2015

Bibliographical note

Funding Information:
The authors appreciate financial support from National Basic Research Program of China , Grant No. 2015CB654700 (2015CB674702), The CAS Hundred Talents Program ( Y220011001 ), the Funds for National Natural Scientific Foundation of China (Nos. 51473156 and 51203147 ) and Jilin Provincial Research Fund for Basic Research , China (No. 20130102007JC ).

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Keywords

1,3-Butadiene polymerization
Cobalt complex
Oxazoline
Pyridine
Quinoline

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10.1016/j.ica.2015.07.013

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title = "Pyridine-oxazoline and quinoline-oxazoline ligated cobalt complexes: Synthesis, characterization, and 1,3-butadiene polymerization behaviors",

abstract = "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.",

keywords = "1,3-Butadiene polymerization, Cobalt complex, Oxazoline, Pyridine, Quinoline",

author = "Jun Guo and Heng Liu and Jifu Bi and Chunyu Zhang and Hexin Zhang and Chenxi Bai and Yanming Hu and Xuequan Zhang",

note = "Funding Information: The authors appreciate financial support from National Basic Research Program of China , Grant No. 2015CB654700 (2015CB674702), The CAS Hundred Talents Program ( Y220011001 ), the Funds for National Natural Scientific Foundation of China (Nos. 51473156 and 51203147 ) and Jilin Provincial Research Fund for Basic Research , China (No. 20130102007JC ). Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved.",

year = "2015",

month = jul,

day = "30",

doi = "10.1016/j.ica.2015.07.013",

language = "English (US)",

volume = "435",

pages = "305--312",

journal = "Inorganica Chimica Acta",

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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 - Funding Information: The authors appreciate financial support from National Basic Research Program of China , Grant No. 2015CB654700 (2015CB674702), The CAS Hundred Talents Program ( Y220011001 ), the Funds for National Natural Scientific Foundation of China (Nos. 51473156 and 51203147 ) and Jilin Provincial Research Fund for Basic Research , China (No. 20130102007JC ). 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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JO - Inorganica Chimica Acta

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ER -

Pyridine-oxazoline and quinoline-oxazoline ligated cobalt complexes: Synthesis, characterization, and 1,3-butadiene polymerization behaviors

Abstract

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