Abstract
AbstractNew monometallic amine‐bis(phenolato)cobalt(II) [(ONNO)RCoII] (R = CMe2Ph; Cl; Br) complexes have been synthesized and fully characterized including X‐ray crystallographic analysis. These CoII complexes show good activity for the formation of cyclic propylene carbonate in combination with tetrabutylammonium bromide (TBAB) as a co‐catalyst. The reaction parameters such as carbon dioxide pressure, co‐catalyst loadings and temperature were varied to determine the ideal reaction conditions. These catalysts were also employed in copolymerization reactions of cyclohexene oxide/CO2 and propylene oxide/CO2. [(ONNO)ClCoII]*(MeOH) was found to effectively copolymerize cyclohexene oxide (CHO) and CO2. This is the first reported amine‐bis(phenolato) cobalt(II) complex to be active in the copolymerization of CO2 and CHO. In‐depth stability studies were conducted (Evan's method) to validate CoII as the active species required for copolymerization. End‐group analysis via NMR, ESI‐MS and MALDI‐TOF revealed the presence of 4‐(dimethylamino)pyridine (DMAP) and methoxy terminated chains.
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