Langmuir · 2008 · 25 citations · 35 references
Natural SciencesChemical EngineeringChemistryChemical KineticsElectroanalytical MethodsPhysical ChemistryBinding KineticsElectrode KineticsIntermolecular ForcesLigand BindingLigand Binding KineticsSurfactantsAnionic SurfactantsMicellar Reaction KineticsMicellizationReaction Rate ConstantsSaturationSorptionSurfactant AdsorptionSurfactant Interactions
The reaction of I (-) with methyl naphthalene-2-sulfonate (MeONs) is accelerated by the micellized sulfobetaine surfactants N-decyl, N-dodecyl, N-tetradecyl, and N-hexadecyl- N, N-dimethylammonio-1-propanesulfonate. Concentrations of micellar-bound I (-) were determined by using ion-selective electrodes (ISE), and capillary electrophoresis. At low concentrations, I (-) incorporation fits Langmuir isotherms and is related to changes in micellar surface potentials. Rate effects of dilute KI are fitted quantitatively by a pseudophase model that describes I (-) binding in terms of a sorption isotherm, but at higher [KI], where the simple model predicts saturation, rates increase due to electrolyte invasion. This model considers transfer equilibria of both reactants between water and micelles and second-order rate constants in each pseudophase. Estimated second-order rate constants for reaction of MeONs with I (-) in the micellar pseudophase are 3.2- to 3.5-fold higher than the second-order rate constant, k 2w, in water, depending on surfactant structure and assumptions in the treatment.
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Ion binding and reactivity at charged aqueous interfaces
Clifford A. Bunton, Faruk Nome, Frank H. Quina et al. · Accounts of Chemical Research · 1991 · 722 citations
Marı́a del Mar Graciani, Amalia Rodrı́guez, María Múñoz et al. · Langmuir · 2005 · 98 citations