Marcus Theory for Ion-Transfer Reactions

In 2000, Marcus proposed an ion-transfer theory based on the recognition that an ion-transfer reaction involves a mechanism for initiating a desolvation from the initial liquid. A, and concerted solvation by the receiving liquid, B [123]. The model involves four steps  

The formation of a protrusion of solvent B penetrating in the solvent A A bimolecular reaction between the ion and the protrusion A diffusion of the attached ion through the interface Detachment of the ion 

The equilibrium constants are simply given by the difference of electrochemical potential between the bulk and the interfacial position  

Following this seminal publication by Marcus, Kornyshev, Kuznetsov, and Urbakh (KKU) discussed the different models of ion transfer and found that three regimes of ion transfer across TTIES can be distinguished [124], 

FIGURE 1.12 Schematic plot of an ion in solvent A (a) approaching a protrusion from solvent B at the A-B interface, (b) passing through the interface and (c) exiting into solvent B from another protrusion, now of B into A. 

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