A very rapid intramolecular two-electron transfer between Ru0 and RuII or a species with two RuI centers is the explanation given for the unusual properties of the cation of 1. 1H- and 13C-NMR spectra are highly symmetric, and further reduction to the Ru neutral complex first takes place at −1.177 ± 0.010 V (vs. SCE). The phenanthrene analogue of 1—one double bond more—behaves completely differently; it obviously contains an RuII center and an Ru0 center.
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Plitzko et al. (1987) studied this question.
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