Ionic parachor and its application to pyridinium-based ionic liquids of {[Cnpy][DCA] (n=2, 3, 4, 5, 6)}
Ionic parachor and its application to pyridinium-based ionic liquids of {[Cnpy][DCA] (n=2, 3, 4, 5, 6)}
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离子parachor及其在吡啶基离子液体中的应用{[Cnpy][DCA] (n=2,3,4,5,6)}
DOI：
10.1016/j.jct.2015.02.025
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发表时间：
2015-10-01
影响因子：
2.6
通讯作者：
Yang, Jia-Zhen
中科院分区：
文献类型：
--
作者：
Ma, Xiao-Xue;Wei, Jie;Yang, Jia-Zhen
合成了三种新型的二氰胺离子液体[C(N)py][DCA](n=3，5，6)和两种[C(N)py][DCA](n=2，4)(N-烷基吡啶二氰胺)，并用H-1核磁共振、C-13核磁共振、差示扫描量热法、高效液相色谱和傅里叶变换红外光谱对其结构进行了表征。在T=298.15 K，用标准加入法测定了它们的密度、表面张力和折射率，计算了[C(N)py][dca](n=2，3，4，5，6)的降落值，根据热力学外假设得到了阴离子[dca]作为参比离子的离子降落值，进而得到了相应的吡啶阳离子[C(N)py](+)的离子降落值P+.利用前文中的[C(N)py](+)和[C(N)mim](+)的P+值，得到了10种阴离子的离子降落值。用离子降落伞计算了47种离子液体的降落伞，比Rowley等人的降落伞计算值更接近实验值。在+/-0.3mJ的0.95置信度水平下，用降落物的估计值预测了52种离子液体的表面张力和22种离子液体的折射率。M(-2)和+/-0.0003。(C)2015爱思唯尔有限公司。保留所有权利。
Three novel dicyanamide ionic liquids (ILs) [C(n)py][DCA] (n = 3, 5, 6) and two [C(n)py][DCA] (n = 2, 4) (N-alkyl-pyridinium dicyanamide) were prepared and characterized by H-1 NMR spectroscopy, C-13 NMR spectroscopy, differential scanning calorimetry (DSC), High Performance Liquid Chromatography (HPLC) and FT-IR spectroscopy. The density, surface tension and refractive index were determined by the standard addition method (SAM) at T = 298.15 K. The experiment values of parachor for [C(n)py][DCA] (n = 2, 3, 4, 5, 6) were calculated and the ionic parachor of anion, [DCA] as a reference ion was obtained in terms of the extrathermodynamic assumption, and then the ionic parachor, P+, of all corresponding pyridinium cations, [C(n)py](+), were obtained. Using the values of P+ of [C(n)py](+) and [C(n)mim](+) in our previous papers, the values of ionic parachor for 10 kinds of anions were obtained. By using the ionic parachor, the values of parachor for 47 ionic liquids were obtained, which are more closed to their experiment values than the values of parachor obtained by Rowley et al. The values of surface tension for 52 ionic liquids and the values of refractive index for 22 ionic liquids were predicted using the estimated values of parachor within their experimental expanded uncertainty at 0.95 confidence level of +/- 0.3 mJ . m(-2) and +/- 0.0003, respectively. (C) 2015 Elsevier Ltd. All rights reserved.