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This study presents the electrochemical properties of room-temperature ionic liquids (RTILs) at a variety of liquid-liquid interfaces. The RTILs used here consist of 1-alkyl-3-methylimidazolium (, ) cations with bis(perfluoromethylsulfonyl)imide (BMSI) and bis(perfluoroethylsulfonyl)imide (BETI) anions. Ion transfer across the polarizable 1,2-dichloroethane/water and the neat RTIL/water interfaces were examined. The ion-transfer experiments suggested that the RTILs made with and BMSI or BETI are moderately hydrophobic with polarizable potential windows as large as for in 1,2-dichloroethane and for the neat interface. In addition, the effect of the junction potential at the aqueous reference electrode/RTIL interface was studied using the oxidation/reduction of ferrocene and decamethylferrocene. The junction potential at the reference electrode was found to decrease as a function of the cation chain length for both anions studied. The of transfer found for all the systems studied was per group of the cation.
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Fitchett et al. (2005) studied this question.
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