Amino Acid and Dipeptide Complexes of Cobalt II

Cobalt(ll) forms many complexes which can exhibit oxygen-carrying properties (2,19). Reversible oxygen uptake in solutions of cobalt (ll)-histidine (33-36), and cobalt (II) in the presence of a-amino acids and peptides (37—39) has been known for some time. The reaction of cobalt (II) with dipeptide was first observed in enzymic studies involving glycyl-glycine (40). 

In strongly basic solution this reaction involves the formation of an hydroxo bridge in addition to the dioxygen bridge 43). The redox potential for the process 

Complexes of Dime thy Igly oxime and Related Ligands 

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