TY - JOUR
T1 - (Pyrazolylethyl-amine)zinc(II) carboxylate complexes as catalysts for the copolymerization of CO2 and cyclohexene oxide
AU - Matiwane, Anelisa
AU - Obuah, Collins
AU - Darkwa, James
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/11/1
Y1 - 2020/11/1
N2 - Pyrazolyl compounds 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyl-amine) (L1), 2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyl-amine (L2), and 2-(3-phenyl-5-(trifluoromethyl)-1H-pyrazol-1-yl)ethyl-amine (L3) were reacted with a mixture of zinc(II) acetate and 3,5-dinitrobenzoic acid to form the bidentate complexes [(2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)-ethyl-amine)-Zn(C6H5COO(NO2)2] (1), [(2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyl-amine)Zn(C6H5COO(NO2)2] (2), and [(2-(5-phenyl-3-(trifluoro-methyl)-1H-pyrazol-1-yl)ethyl-amine)Zn(C6H5COO(NO2)2] (3) respectively. All three zinc complexes were tested as catalysts for the copolymerization of CO2 and cyclohexene oxide (CHO) and found active to form poly(cyclohexene carbonate) (PCHC) and cyclohexene carbonate (CCHC) at CO2 pressures as low as 1.5 MPa and under solvent-free conditions in the absence of a co-catalyst. Increase in CO2 pressure resulted in activity and showed selectivity up to 99% selectivity for the formation of the copolymer PCHC. Optimum temperature for the polymerization was 100 °C and even at this temperature selectivity towards formation of PCHC was found to be 99%. The copolymers obtained have moderate molecular weights (3860–11,500 g/mol) and polydispersity indices varying from 2.73 to 4.93.
AB - Pyrazolyl compounds 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyl-amine) (L1), 2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyl-amine (L2), and 2-(3-phenyl-5-(trifluoromethyl)-1H-pyrazol-1-yl)ethyl-amine (L3) were reacted with a mixture of zinc(II) acetate and 3,5-dinitrobenzoic acid to form the bidentate complexes [(2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)-ethyl-amine)-Zn(C6H5COO(NO2)2] (1), [(2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyl-amine)Zn(C6H5COO(NO2)2] (2), and [(2-(5-phenyl-3-(trifluoro-methyl)-1H-pyrazol-1-yl)ethyl-amine)Zn(C6H5COO(NO2)2] (3) respectively. All three zinc complexes were tested as catalysts for the copolymerization of CO2 and cyclohexene oxide (CHO) and found active to form poly(cyclohexene carbonate) (PCHC) and cyclohexene carbonate (CCHC) at CO2 pressures as low as 1.5 MPa and under solvent-free conditions in the absence of a co-catalyst. Increase in CO2 pressure resulted in activity and showed selectivity up to 99% selectivity for the formation of the copolymer PCHC. Optimum temperature for the polymerization was 100 °C and even at this temperature selectivity towards formation of PCHC was found to be 99%. The copolymers obtained have moderate molecular weights (3860–11,500 g/mol) and polydispersity indices varying from 2.73 to 4.93.
KW - Carbon dioxide
KW - Cyclohexene carbonate
KW - Poly(cyclohexene carbonate)
KW - Pyrazole
KW - Zinc(II) complex
UR - http://www.scopus.com/inward/record.url?scp=85090704460&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2020.114767
DO - 10.1016/j.poly.2020.114767
M3 - Article
AN - SCOPUS:85090704460
SN - 0277-5387
VL - 190
JO - Polyhedron
JF - Polyhedron
M1 - 114767
ER -