Electron transfer from the benzophenone ketyl radical anion to 9,10-anthraquinone-2-sulphonate and methylviologen in water-propan-2-ol mixtures

Abstract

The electron transfer reaction between the benzophenone ketyl radical anion ((C6H5)2CO-{radical dot} and (i) the 9,10-anthraquinone-2-sulphonate anion (AQS) and (ii) the methylviologen cation (MV2+) was studied in a 1:1 (v/v) water-propan-2-ol mixture using the technique of flash photolysis. The kinetics of the formation of the respective products 9,10-anthraquinone-2-sulphonate radical anion (AQS-{radical dot}) and the methylviologen radical cation (MV+{radical dot}) were analysed by using the Runge-Kutta fourth-order numerical solution for the system of differential equations that pertain to the proposed kinetic scheme. Equilibrium constants for the reactions (C6H5)2CO-{radical dot} + AQS ..