The reduction of fluorescein in aqueous solution (at pH 6). A new DISP2 reaction

Abstract

It is shown using linear sweep and rotating-disc voltammetry that the reduction of the dye fluorescein at ca. pH 6 in aqueous solution proceeds via a DISP2 mechanism. In particular the rotating-disc measurements show voltammetric waves which display a shift in the half-wave potential with disc rotation speed and which also analyse to give curved Tafel plots entirely in agreement with the behaviour predicted theoretically for a DISP2 process on the basis of a reaction layer treatment.