Co(II) complexes bearing amine-bridged bis(phenolato) complexes have been synthesized through reactions of bis(phenols) with CoCl or Co(OAc). Oxidation of the Co(II) complex with air resulted in partial oxidation, generating mixed valence Co(II/III) complexes and . In addition, due to the presence of alkali compounds (KOAc and NaOMe), and formed as Co-alkali metal heterometallic complexes, which are the first example of mixed valence Co(II/III)-M(I) (M = K or Na) complexes. Complexes showed good activity in the cycloaddition of epoxides and CO under atmospheric pressure, generating cyclic carbonates in 40-99% yields. Co(II/III)-Na(I) complex performed better in reactions of bulkier substrates, underlining the enhanced activity of mixed valence Co-alkali metal heterometallic complexes. On the contrary, complex showed limited activity in copolymerization of epoxide and CO.
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