1-乙基-3-甲基咪唑丙氨酸离子液体热力学性质的研究

doi:10.3866/PKU.WHXB201509111

Abstract

Abstract:

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 (Δ_solH_m) 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] (Δ_solH_m^θ) and calculated its apparent relative molar enthalpy (^ΦL). Using Glasser's theory of lattice energy, we obtained the lattice energy, U_POT = 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] (C_p(sol)) and its apparent molar heat capacity (^ΦC_p) at various specific molalities.

Key words: Ionic liquid, Enthalpy of solution, Heat capacity, Hydration enthalpy, Lattice energy

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Ling. ZHENG,Ben-Han. FAN,Xiao-Xue. BU,Yi. PAN,Jia-Xin. DONG,Wei. GUAN. Study on Thermodynamic Properties of Ionic Liquid 1-Ethyl-3-methylimidazolium Alanine[J]. Acta Phys. -Chim. Sin. 2015, 31(11), 2036-2042. doi: 10.3866/PKU.WHXB201509111

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Study on Thermodynamic Properties of Ionic Liquid 1-Ethyl-3-methylimidazolium Alanine

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