A series of Co(II) complexes bearing pyridine-imino ligands [2-Ar1-6-(CMe = NAr2)C5H3N]CoCl2 (Ar1 = C6H5, Ar2 = 2,6-i-Pr2C6H3 (3a); Ar1 = 2′-C10H7, Ar2 = 2,6-i-Pr2C6H3 (3b); Ar1 = 2′-C10H7, Ar2 = C6H5 (3c); Ar1 = 2′-C10H7, Ar2 = 4-ClC6H4 (3d); Ar1 = 4′-C6H5-C6H4, Ar2 = 2,6-i-Pr2C6H3 (3e); Ar1 = 4′-C6H5-C6H4, Ar2 = C6H5 (3f); Ar1 = 4′-C6H5-C6H4, Ar2 = 4-ClC6H4 (3g)) with bulky aryl groups were synthesized and characterized. Determined by single-crystal X-ray diffraction, 3a, 3b, and 3e adopted distorted tetrahedron configurations. Activated by ethylaluminum sesquichloride (EASC), these complexes exhibited high cis-1,4 selectivity for 1,3-butadiene polymerization. The steric and electronic properties of substituent of the ligand remarkably influenced catalytic activity. The effects of polymerization parameters such as [Al]/[Co] ratio and temperature on the polymerization were also investigated in details.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of Organometallic Chemistry|
|State||Published - Dec 1 2015|
Bibliographical noteFunding Information:
The authors appreciate financial support from National Basic Research Program of China , Grant No. 2015CB654700 ( 2015CB674702 ), The CAS Hundred Talents Program ( Y220011001 ), the Fund for National Natural Scientific Foundation of China (No. 51473156 ), National Natural Scientific Foundation of China (No. 51203147 ) and Jilin Provincial Research Fund for Basic Research, China (No. 20130102007JC ).
© 2015 Elsevier B.V.
- 1,3-Butadiene polymerization
- Cobalt complex
- Pyridine-imino ligand