Abstract
Although the π* system of the bridging ligand in the µ-quinoxaline-bis(penta-ammineruthenium)(5+) ion (2) is considerably lower in energy than the π* system of the bridging ligand in the previously reported µ-pyrazine-bis(penta-ammineruthenium)(5+) ion (1), the near i.r. transition for (2)(νmax 5900 cm–1) occurs at essentially the same energy as that for (1)(νmax 6300 cm–1), a result suggestive of the mixed-valence RuII–RuIII representation of the ion as opposed to a delocalized RuII½–RuII½ description.
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