Micellar effects on the kinetics of the oxidation of the excited state of the [Ru(bpy)(3)](2+) complex by S2O82-. A comparison of different approaches for the interpretation of micellar effects on kinetics

The title reaction was studied in micellar solutions of sodium bis(2-ethylh exyl) sulfosuccinate (AOT) as well as in sodium nitrate and in sodium n-oct anesulfonate solutions. In all cases, a decrease in the rate constant with increasing surfactant or salt concentration is observed. These results are rationalized using both the pseudophase model and the Bronsted equation. Th e equivalence of these approaches is shown. In the case of micellar solutio ns, a non-negligible influence of premicellar aggregates is detected. The c onditions of applicability of these approaches are discussed.