Determination of the Molar Enthalpy of Solution for Ionic Liquid [C5mim][OAc](1-pentyl-3-methylimidazolium acetate) in the Temperature Range from 288.15 to 308.15 K

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• 作者：Zhiheng Zhang ; Qiubo Zhang ; Fang Tian ; Wei Guan ; Jiazhen Yang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：July 10, 2014
• 年：2014
• 卷：59
• 期：7
• 页码：2159-2163
• 全文大小：217K
• ISSN：1520-5134

文摘

The molar enthalpies of solution, 螖_solH_m, for ionic liquid [C₅mim][OAc] with different molalities were measured by the solution-reaction isoperibol calorimeter in the temperature range from 288.15 to 308.15 K with an interval of 5 K. According to Archer鈥檚 method, the standard molar enthalpies of solution, 螖_solH_m^胃, and the apparent relative molar enthalpy, ^桅L, for [C₅mim][OAc] were determined. In terms of Glasser鈥檚 theory of lattice energy, the hydration enthalpy of the cation, 螖H₊ ([C₅mim]⁺) = 鈭?78 kJ路mol^鈥? was obtained at 298.15 K. Compared with hydration enthalpy of [C₂mim]⁺, 螖H₊ ([C₂mim]⁺) = 鈭?33 kJ路mol^鈥?, the hydration of [C₅mim]⁺ is weaker than [C₂mim]⁺. The plot of 螖_solH_m^胃 vs (T 鈥?298.15) K is a good straight line and its slope is the standard molar heat capacity of solution, 螖C_p,m^胃 = 231 J路K^鈥?路mol^鈥?, so that the specific heat capacity of solution, 螖C_p^胃 = 1.09 J路g^鈥?路K^鈥?, was obtained for IL [C₅mim][OAc].