Abstract
The electrochemical oxidation of Ru(bpy)/sub 3//sup 2 +/ and Fe(bpy)/sub 3//sup 2 +/ in liquid sulfur dioxide was investigated. Ru(bpy)/sub 3//sup 2 +/ shows two oxidation waves corresponding to the 3+ (1.01 V) and 4+ (2.76 V) forms while Fe(bpy)/sub 3//sup 2 +/ undergoes three oxidations to the 3+ (0.70 V), 4+ (2.92 V), and 5+ (approx.3.09 V) forms. While the 3+ form is stable for both compounds on a coulometric time scale, the higher oxidation states react with solvent to regenerate the 3+ form. The kinetics of this reaction was studied as a function of temperature by cyclic voltammetry, chronocoulometry, and chronoamperometry.
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