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

物理化学学报 >> 2015, Vol. 31 >> Issue (11): 2036-2042.doi: 10.3866/PKU.WHXB201509111

1-乙基-3-甲基咪唑丙氨酸离子液体热力学性质的研究

郑玲¹,樊本汉¹,卜晓雪¹,潘懿¹,董家新²,关伟^1,*()

¹ 辽宁大学化学院,沈阳110036
² 广西师范大学化学化工学院,广西桂林541004

收稿日期:2015-07-30 发布日期:2015-11-13
通讯作者: 关伟 E-mail:guanweiy@sina.com
基金资助:
国家自然科学基金(21173107);辽宁省高等学校优秀人才支持计划(2015025)

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

Ling. ZHENG¹,Ben-Han. FAN¹,Xiao-Xue. BU¹,Yi. PAN¹,Jia-Xin. DONG²,Wei. GUAN^1,*()

¹ College of Chemistry, Liaoning University, Shenyang 110036, P. R. China
² College of Chemistry & Chemical Engineering, Guangxi Normal University, Guilin 541004, Guangxi Province, P. R. China

Received:2015-07-30 Published:2015-11-13
Contact: Wei. GUAN E-mail:guanweiy@sina.com
Supported by:
the National Natural Science Foundation of China(21173107);Liaoning Excellent Talents in University, China(2015025)

摘要/Abstract

摘要：

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(Δ_solH_m^θ).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(Δ_sol),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U_POT = 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(C_p(sol))和表观摩尔热容(^ΦC_p).

关键词: 离子液体, 溶解焓, 热容, 水化焓, 格子能

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

MSC2000:

O642

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郑玲,樊本汉,卜晓雪,潘懿,董家新,关伟. 1-乙基-3-甲基咪唑丙氨酸离子液体热力学性质的研究[J]. 物理化学学报, 2015, 31(11): 2036-2042.

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.

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1-乙基-3-甲基咪唑丙氨酸离子液体热力学性质的研究

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

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