用中和法合成了氨基酸离子液体1-乙基-3-甲基咪唑丙氨酸([C2mim][Ala]),并利用恒温环境的溶解反应热量计,在(288.15±0.01) K-(308.15±0.01) K温度范围内每隔5 K,测定不同质量摩尔浓度离子液体在水中的溶解焓(ΔsolHmθ).根据Archer的方法,通过线性拟合得到了该离子液体的标准摩尔溶解焓(Δsol),并计算了其相对表观摩尔溶解焓(ΦL).在298.15 K下,根据Glasser经验方法得到了格子能UPOT = 566 kJ·mol-1,并计算了其阴阳离子水化焓值(ΔH+ + ΔH-) = -620 kJ·mol-1及阴离子水化焓ΔH-([Ala]-) = -387 kJ·mol-1.此外,估算了[C2mim][Ala]水溶液的热容(Cp(sol))和表观摩尔热容(ΦCp). We synthesized the alanine-based ionic liquid [C2mim][Ala] (1-ethyl-3-methylimidazolium alanine) by using the neutralization method and characterized it. Using a solution-reaction isoperibol calorimeter, we determined the molar enthalpies of the solution (ΔsolHm) at various molalities in water from (288.15±0.01) to (308.15±0.01) K in intervals of 5 K. Using Archer's method, we obtained the standard molar enthalpy of solution for [C2mim][Ala] (ΔsolHmθ) and calculated its apparent relative molar enthalpy (ΦL). Using Glasser's theory of lattice energy, we obtained the lattice energy, UPOT = 566 kJ·mol-1, the hydration enthalpy of the cation and anion, (ΔH+ + ΔH-) = -620 kJ·mol-1, and the hydration enthalpy of an anion, ΔH-([Ala]-) = -387 kJ·mol-1 at 298.15 K. Finally, we obtained the heat capacity of aqueous [C2mim][Ala] (Cp(sol)) and its apparent molar heat capacity (ΦCp) at various specific molalities
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