Abstract
The functions of heme-proteins in their natural systems may all be regarded as related to oxidation reduction processes. It is a characteristic feature of these substances that the actual functions they serve vary broadly with the specific heme protein and the potentials for the Fe2+/Fe3+ couple vary correspondingly over a substantial range of values. Much of the interest in the metal complexes of synthetic macrocyclic ligands is understandably related to their structural similarity to the heme prosthetic group. Complexes with synthetic macrocyclic ligands have provided uniquely convenient systems for evaluation of the dependence of oxidation reduction properties of metal chelates on the detailed structure of the ligand while maintaining a given metal ion in an approximately constant coordination geometry. The complexes of tetraaza tetradentate macrocycles have figured most heavily in these studies and are the subject of this report. A variety of kinds of processes are possible, depending primarily on
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