Abstract
The molar enthalpies of solution, ΔsolHm(wc), of a new amino acid ionic liquid 1-butyl-3-methylimidazolium glutamine [Bmim][Glu], containing various amounts of water and with various aqueous molalities, were measured with a solution-reaction isoperibol calorimeter at (298.15 ± 0.01) K, where wc denotes water content. The standard molar enthalpies of solution of [Bmim][Glu] with given amounts of water, ΔsolH0m(wc), were obtained according to Archer’s method. To eliminate the effect of the small amount of water in [Bmim][Glu], a linear fitting of ΔsolH0m(wc) versus the water content was carried out, and the intercept, ΔsolH0m (pure ionic liquid) = −(40.55 ± 0.06) kJ·mol−1, is the standard molar enthalpy of solution of anhydrous [Bmim][Glu]. Furthermore, the Glasser’s theory of lattice energy was used to estimate the hydration enthalpy of glutamine anion [Glu]−.
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