Michael R. Norris, Urisnus College, Boyertown, PA
The pentanuclear mixed-valence coordination compound [(NH3)5Ru-NC-Fe(CN)4-CN-Pt(NH3)4-NC-Fe(CN)4-CN-Ru(NH3)5] (RuFePtFeRu)(OSO2CF3)2 was synthesized and characterized by IR and UV/VIS spectroscopy, and cyclic voltammetry. The molecule exhibits an FeII to PtIV intervalent (IT) electronic absorption band at 409 nm and a similar FeII to RuIII transition at 798 nm. The energies, intensities, and half-widths of these transitions correspond well with those of model compounds. The electrochemistry is unusual in the sense that electrochemical reduction of the Ru moieties leads to a double intramolecular electron transfer from Ru to Pt and the simultaneous dissociation of the complex into one Pt(II) and two Fe(II)-Ru(III) fragments. This proposed ECE mechanism, however, is dependent upon the exact nature of the reactants and the reaction conditions. The spectroscopic and electrochemical properties of different geometric isomers of RuFePtFeRu are currently under investigation.
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