The reduction of [Co(edta)]- by [Fe(CN)6]2- is facile in water, but is remarkably “switched off” when conducted in reverse micelle microemulsions (M. D. Johnson, B. B. Lorenz, P. C. Wilkins, B. G. Lemons, B. Baruah, N. Lamborn, M. Stahla, P. B. Chatterjee, D. T. Richens, D. C. Crans, Inorg. Chem. , 2012 , 51 , 2757.).
a. Is the electron transfer mechanism for these two reactants believed to be inner-sphere or outer-sphere?
b. These reactions were carried out under pseudo-first order conditions. Why do plots of kobs versus [Fe(CN)6]2- from these experiments exhibit linear relationships? What does the y -intercept of 0 communicate about these electron transfer reactions? How is kobs related to the bimolecular rate constant k1 for the reduction of [Co(edta)]- ?
c. What is the hypothesis for the suppressed reduction of [Co(edta)]- by [Fe(CN)6]2- when attempted in reverse micelle microemulsions?
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