Oxidation-reduction potentials obtained by chronopotentiometric methods at a platinum electrode in an acetonitrile solution indicate electron withdrawing substituents decrease the ease of oxidation, while electron donating substituents increase the ease of oxidation with respect to the parent metallocenes. This is in accord with the results normally expected from inductive effects. The E114 values of ferrocene and its derivatives have been correlated with the substituent constants of the Ingold-Taft equation. Ruthenocene has been observed to undergo a one step, two-electron oxidation while osmocene undergoes a two step, one electron each, oxidation.Ferrocene shows only a one electron transfer. The reversibilities of the electrode reactions are evaluated.

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