The osmotic and activity coefficients and vapor pressures of binary mixtures containing the
alcohols 1-propanol, 2-propanol, 1-butanol, 2-butanol and 1-pentanol and the ionic liquid 1-hexyl-
3-methylimidazolium bis(trifluoromethylsulfonyl)imide, C6MimNTf2, were determined at T = 323.15 K
using the vapor pressure osmometry technique. The experimental osmotic coefficients were correlated
using the Extended Pitzer model of Archer and the MNRTL model, obtaining standard deviations lower
than 0.020 and 0.049, respectively. The mean molal activity coefficients and the excess Gibbs free energy
for the studied mixtures were calculated from the parameters of the Extended Pitzer model of Archer.
Besides the effect of the alkyl-chain of the alcohol and the position of the alcohol group, the effect of the
alkyl-side chain of the cation of the ionic liquid can be assessed comparing the experimental results with
those previously obtained for imidazolium bis(trifluoromethylsulfonyl)imide ionic liquids with different
alkyl-side chain lengths.
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