Abstract
For the binary ionic liquid (IL)−water (W) two-phase systems formed by the ILs 1-methyl-3-octylimidazolium bis(trifluoromethanesulfonyl)amide ([C8mim+][C1C1N−]) and tetrahexylammonium bis(trifluoromethanesulfonyl)amide, which have a common anion, the activities of [C8mim+][C1C1N−] in the water-saturated binary IL phase have been determined from the solubility of C8mim+ in the W phase at different mole fractions of the IL (xC8mimC1C1NIL) at five different temperatures between (278 and 328) K. The variation of the activity coefficients of [C8mim+][C1C1N−] in the IL phase with xC8mimC1C1NIL is by and large in harmony with the regular solution model. However, small but systematic deviations from the model have been discerned and are likely to result from the phase transition of the binary ILs at xC8mimC1C1NIL ≈ 0.3, which causes changes in the microheterogeneity in the assemblies of the IL-constituent ions. The standard Gibbs energy for transfer of [C8mim+][C1C1N−] from the water-saturated IL to W (ΔtrGm,C8mi...
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