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Co(III) is the classic example of an inert d6 metal ion, yet it undergoes fast ligand exchange in the cobalt corrinoids. This suggests that Co(III) has some (labile) Co(II) character when coordinated in the equatorial plane by the macrocycle corrin. The nature of Co(III) is probed by examining the product of its reactions with amident nucleophiles. Based on these solid state observations, and our kinetics results, we suggest that Co (III) in the cobalamins does indeed have some Co(II) character.

Probing the nature of the Co(III) ion in cobalt corrinoids: the structures of some B12derivatives with coordinated ambidentate nucleophiles

Probing the nature of the Co(III) ion in cobalt corrinoids: the structures of some B₁₂derivatives with coordinated ambidentate nucleophiles