The highest number, so far, of well-resolved, completely reversible reduction waves of a molecular compound is found during the stepwise reduction of the tetranuclear [2×2] Co grid-type complex 1 (R=Ph) by a total of 11 electrons. The associated (differential) cyclic voltammogram (see picture) shows ten reduction waves, which represent ten reduced species of remarkable stability.
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Ruben et al. (2000) studied this question.
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