As a cobalt complex used as a chiral selector of PVC membrane electrode, (Acetato-κO)[[2,2'-[(1R,2R)-1,2-cyclohexanediylbis[(nitrilo-κN)Methylidyne]]bis[4,6-bis(1,1-diMethylethyl)phenolato-κO]](2-)]cobalt can be used as a highly active catalysts for the copolymerization of propylene oxide and carbon dioxide.