Determination of the enthalpy of vaporization and prediction of surface tension for ionic liquid 1-alkyl-3-methylimidazolium propionate [C(n)mim][Pro](n = 4, 5, 6).
Determination of the enthalpy of vaporization and prediction of surface tension for ionic liquid 1-alkyl-3-methylimidazolium propionate [C(n)mim][Pro](n = 4, 5, 6).
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DOI：
10.1021/jp509240w
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
J. Tong;Hong-Xu Yang;Ru-Jing Liu;Chifeng Li;Lixin Xia;Jia-zhen Yang
中科院分区：
文献类型：
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作者：
J. Tong;Hong-Xu Yang;Ru-Jing Liu;Chifeng Li;Lixin Xia;Jia-zhen Yang
采用等温重量分析法测定了离子液体1-烷基-3-甲基咪唑丙酸盐[C（n）mim][Pro]（n = 4，5，6）在平均温度T（av）= 445.65 K时的蒸发速率Δ（g）lH（o）m（T（av））。利用Verevkin方法，基于统计热力学计算了[C（n）mim][Pro]（n = 2，3，4，5，6）的汽液相热容差Δ（g）lC（p）（o）m。因此，使用Δ（g）lC（p）（o）m，Δ（g）lH（o）m（T（av））的值分别转化为[C（n）mim][Pro]（n = 4，5，6）的Δ（g）lH（o）m（298），126.8，130.3和136.5。根据新的极性标度，预测了[C（n）mim][Pro]（n = 2，3，4，5，6）的极性顺序，即极性随亚甲基的增加而降低.提出了非质子离子液体表面张力与蒸发焓关系的新模型，并用于预测[C（n）mim][Pro]（n = 2，3，4，5，6）等离子液体的表面张力。预测的离子液体的表面张力与实验结果吻合得很好。
With the use of isothermogravimetrical analysis, the enthalpies of vaporization, Δ(g)lH(o)m(T(av)), at the average temperature, T(av) = 445.65 K, for the ionic liquids (ILs) 1-alkyl-3-methylimidazolium propionate [C(n)mim][Pro](n = 4, 5, 6) were determined. Using Verevkin's method, the difference of heat capacities between the vapor phase and the liquid phase, Δ(g)lC(p)(o)m, for [C(n)mim][Pro](n = 2, 3, 4, 5, 6), were calculated based on the statistical thermodynamics. Therefore, with the use of Δ(g)lC(p)(o)m, the values of Δ(g)lH(o)m(T(av)) were transformed into Δ(g)lH(o)m(298), 126.8, 130.3, and 136.5 for [C(n)mim][Pro](n = 4, 5, 6), respectively. In terms of the new scale of polarity for ILs, the order of the polarity of [C(n)mim][Pro](n = 2, 3, 4, 5, 6) was predicted, that is, the polarity decreases with increasing methylene. A new model of the relationship between the surface tension and the enthalpy of vaporization for aprotic ILs was put forward and used to predict the surface tension for [C(n)mim][Pro](n = 2, 3, 4, 5, 6) and others. The predicted surface tension for the ILs is in good agreement with the experimental one.