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- W1991532788 abstract "The ferrocene-ferricinium electrode (Pt/Foc, Fic+) was investigated in water, acetonitrile, ethanol, DMSO and DMF using single scan cyclic voltammetry and phase sensitive ac polarography. The oxidation-reduction is pseudo-reversible in all five solvents with an electrochemical rate constant of approximately 10−2 cm/s. In all solvents a slow irreversible chemical step involving the ferricinium cation follows electron transfer, so that slow cyclic voltammetry or polarography rather than potentiometry is preferred if ferrocene is to be used as a reference electrode in non-aqueous solvents. The Strehlow assumption, ΔGtr(Foc) = ΔGtr(Fic+ gives very different free energies of transfer of single ions from non-aqueous solvents to water when compared with the TATB assumption that ΔGtr(Ph4As+) = ΔGtr(Ph4B−). This discrepancy is likely to be because ferricinium is only a moderately large cation, so that ΔGtr(Fic+) is less positive than ΔGtr(Foc) for transfer to water. The discrepancy is not because of abnormal electrochemical behavior of the Pt/Foc, Fic+ electrode in water or other solvents. Values of E° vs nhe, H2O in a variety of solvents based on the TATB assumption are presented." @default.
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- W1991532788 date "1973-12-01" @default.
- W1991532788 modified "2023-09-26" @default.
- W1991532788 title "Solvation of ions—XX. The ferrocene—ferricinium couple and its role in the estimation of free energies of transfer of single ions" @default.
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- W1991532788 doi "https://doi.org/10.1016/0013-4686(73)87030-6" @default.
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