Influence of the mixed micelles on the electron transfer reaction [Co(NH3)5Cl]2+ + [Fe(CN)6]4−

Abstract Electron transfer reaction between chloropentaamminecobalt (III) and hexacyanoferrate (II) has been studied in the mixed surfactant aqueous solutions of sodium dodecyl sulfate (SDS) and octylphenol (ethylene oxide) 9.5 ether (TX-100). The observed rate constants k obs have been determined for various micellar media with different compositions. A pseudophase model together with an outer-sphere electron transfer reaction mechanism has been used to analyze the experimental results to obtain the precursor complex formation equilibrium constant K IP , the electron transfer rate constant k et , and the pseudophase equilibrium constant K . The dependence of those parameters on the micellar concentration has been discussed.