Abstract
Gibbs free energy calculations have been performed to calculate the change in the simulated redox properties of FcC6S–/C12S–Au and FcC6S–/C4S–Au in three different electrolytes (NaClO4, Na2SO4 and NaPF6). The effect of surface ion association between the ferricinium cation and the electrolyte anions is investigated on the redox properties of SAMs. The microscopic description of the binary SAMs before and after oxidation indicates that the formation of surface ion pairs is strongly correlated with the hydration energy of the corresponding anion. The correlation between the desolvation of the anions and the ion-pairs formation is established. We have shown from the energy contributions that a general understanding of the thermodynamic behavior of these systems should be analyzed in the context of the enthalpy–entropy compensation effect.
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