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Cobalt complexes containing salen-type pyridoxal ligand and DMSO for cycloaddition of carbon dioxide to propylene oxide

Authors :
Junseong Lee
Saem Hwang
Sung Hoo Jung
Ji Yeon Ryu
Hyoung-Ryun Park
Source :
Polyhedron. 178:114353
Publication Year :
2020
Publisher :
Elsevier BV, 2020.

Abstract

Cobalt complexes containing a salen-type pyridoxal ligand with pyridine were synthesized as a new Co(III) catalytic system for the cycloaddition of carbon dioxide. Two cobalt(III) complexes possessing a salen-type pyridoxyl ligand were synthesized by the reaction of pyridoxal ligands (pyr2en = (N,N′-bis(pyridoxylideneiminato)ethylene) and pyr2cy = (N,N′-bis(pyridoxylideneiminato)cyclohexane)) and Co(OAc)2 and characterized by various analytical methods, including infrared spectroscopy and high-resolution mass analysis. Single-crystal X-ray crystallography analysis confirmed that the cobalt pyr2en complex had a distorted octahedral structure: the tetradentate Schiff base ligand binds the cobalt metal in one plane, and the metal center adopts an octahedral geometry by the additional coordination of acetate and dimethyl sulfoxide. The synthesized complexes were used as catalysts in the cycloaddition of carbon dioxide (CO2) to propylene oxide. The catalysts showed high activity for cycloaddition between CO2 and epoxides, even at a low loading (0.5 mol%), in the presence of various cocatalysts.

Details

ISSN :
02775387
Volume :
178
Database :
OpenAIRE
Journal :
Polyhedron
Accession number :
edsair.doi...........e3e52750586d8db6bee41339f913e432
Full Text :
https://doi.org/10.1016/j.poly.2020.114353