The electrochemistry of a large number of transition metal complexes of iron, cobalt, chromium, and ruthenium have been examined regarding their anodic and cathode peak potential, peak separation, and reversibility as a function of a broad p H range. Criteria for reversibility are considered. In addition, absorption and/or color characteristics have been described at a fixed p H. The stability of stored samples in terms of cyclic voltammetry and absorption spectra has been examined for a given period of time. A significant number of redox couples have properties which should make them useful in photoelectrochemistry, and other electrochemical applications, catalysis, redox flow cells, and the like.
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Ibáñez et al. (1987) studied this question.