Enthalpy of Solution of the Amino Acid Ionic Liquid 1-Butyl-3-methylimidazolium Glutamine

作者：Qingguo Zhang, Kedi Cai, Zhenxing Jin, Shuanglong Wang, Si-Si Sun · 发表于：Journal of Chemical & Engineering Data · 年份：2010 · DOI：10.1021/je100137g · 被引用次数：8 · 研究领域：Ionic liquids properties and applications、Chemical and Physical Properties in Aqueous Solutions、Chemistry and Chemical Engineering

The molar enthalpies of solution, Δ sol H m (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, Δ sol H 0 m (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 Δ sol H 0 m (wc) versus the water content was carried out, and the intercept, Δ sol H 0 m (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] − .