Effect of ligand protonation on the facilitated ion transfer reactions across oil|water interfaces. V. Applications of forced hydrodynamic conditions

Abstract

Hydrodynamic forced conditions applied to the aqueous or the organic phase during a potential sweep can be used to elucidate themechanisms of ion transfer across liquid|liquid interfaces. The aimof this study is to confirm experimentally the previous proposed global mechanisms of facilitated proton transfer via water autoprotolysis and to extend them, controlling the mass transport.We showthat proton transfer assisted by quinidine via waterautoprotolysis is an interesting example, where the ion transfer reaction occurs with the formation of different products in each phase, i.e., protonated weak base in the organic phase and the hydroxide ion in the aqueous phase. Furthermore, one of the reactants (water) is always in excess with respect to the other one (neutral weak base). These features provide unique characteristics to facilitated proton transfer via water autoprotolysis to be explored by applying forced hydrodynamic conditions.