Small change-large effect. When two Nmethyl groups on one N atom are replaced by hydrogen atoms in each of the diamino hgands in 1, M = Co, the bridging aqua ligand is ousted and an asymmetric dicobalt complex with one five-coordinate, one six-coordinate metal center, and three bridging carboxylato ligands results. This type of structural tuning is important for modeling, for example, the metal coordination environment in diiron(ii) non-heme proteins in which a coordination site on one metal is open.
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Hagen et al. (1993) studied this question.
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