Enthalpy of Dilution of Aqueous [C₄mim][Gly] at 298.15 K

A novel amino acid ionic liquid [C₄mim][Gly] (1-butyl-3-methylimidazolium glycine) was prepared by a neutralization method. The molar enthalpies of dilution, Δ_DH_m(m_i→m_f), of aqueous [C₄mim][Gly] at various molalities were measured at (298.15 ± 0.01) K. The values of the apparent relative molar enthalpy, ^φL, were calculated by using both the extended Debye−Hückel equation and the Pitzer equation, which were in good agreement within experimental error. In terms of ^φL, the molar enthalpies of solution of [C₄mim][Gly], Δ_sH_m, at various molalities were estimated. The estimated values of Δ_sH_m were consistent with the experimental values previously obtained.