Structure-property relationships in ILs: A study of the alkyl chain length dependence in vaporisation enthalpies of pyridinium based ionic liquids
Structure-property relationships in ILs: A study of the alkyl chain length dependence in vaporisation enthalpies of pyridinium based ionic liquids
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DOI：
10.1007/s11426-012-4662-2
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发表时间：
2012-06
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通讯作者：
D. Zaitsau;Andrei V. Yermalayeu;V. N. Emel’yanenko;S. P. Verevkin;U. Welz-Biermann;T. Schubert
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文献类型：
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作者：
D. Zaitsau;Andrei V. Yermalayeu;V. N. Emel’yanenko;S. P. Verevkin;U. Welz-Biermann;T. Schubert
采用石英晶体微天平技术结合Langmuir蒸发法测定了含双（三氟甲基磺酰基）酰亚胺阴离子[CnPy][NTf 2]（n= 2，3，4，5，6）的吡啶类离子液体的蒸发速率。发现了汽化率与链长的线性关系。基于体积、表面张力和声速测量的新方法已被开发用于估计气相和液相之间的热容差，这是将测量的汽化率调整到参考温度298 K所需的。
The enthalpies of vaporization for the series of pyridinium-based ionic liquids with bis(trifluoromethylsulfonyl)imide anion [CnPy][NTf2] (n= 2, 3, 4, 5, and 6) have been determined with the quartz crystal microbalance technique combined with the Langmuir evaporation. The linear dependence of vaporization enthalpies on the chain length has been revealed. New approach based on volumetric, surface tension, and speed of sound measurements has been developed for estimation of heat capacity differences between gas and liquid phase, which were required for adjustment of measured vaporization enthalpies to the reference temperature 298 K.