Ionic parachor and its application in acetic acid ionic liquid homologue 1-alkyl-3-methylimidazolium acetate {[C(n)mim][OAc](n = 2,3,4,5,6)}.
Ionic parachor and its application in acetic acid ionic liquid homologue 1-alkyl-3-methylimidazolium acetate {[C(n)mim][OAc](n = 2,3,4,5,6)}.
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DOI：
10.1021/jp207882t
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
W. Guan;Xiaoxue Ma;Long Li;J. Tong;Da-Wei Fang;Jia-zhen Yang
中科院分区：
文献类型：
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作者：
W. Guan;Xiaoxue Ma;Long Li;J. Tong;Da-Wei Fang;Jia-zhen Yang
采用中和法合成了5种乙酸型离子液体[C（n）mim][OAc]（n = 2，3，4，5，6）（1-烷基-3-甲基咪唑乙酸盐），并通过（1）HNMR谱和差示扫描量热法（DSC）对其进行了表征。在298.15 ± 0.05K下测定了它们的密度和表面张力。由于AcAILs可以与水强烈地形成氢键，因此难以通过常规方法从AcAILs中除去少量的水。为了消除微量水的影响，采用标准加入法（SAM）进行测定。提出了离子降落伞的新概念。[OAc]（-）被看作是一个参考离子，它的离子parachor的个人价值被确定在两个extrathermodynamic假设。然后，利用参比离子的离子降落伞值，得到了[NTf（2）]（-），[Ala]（-），[AlCl（4）]（-），[GaCl（4）]（-）等离子的离子降落伞值，并估算了文献中所研究的离子液体的降落伞值和表面张力。相比之下，估计值与其匹配的实验值相关性很好。
Five acetic acid ionic liquids (AcAILs) [C(n)mim][OAc](n = 2,3,4,5,6) (1-alkyl-3-methylimidazolium acetate) were prepared by the neutralization method and characterized by (1)HNMR spectroscopy and differential scanning calorimetry (DSC). The values of their density and surface tension were measured at 298.15 ± 0.05 K. Since the AcAILs can strongly form hydrogen bonds with water, the small amounts of water are difficult to remove from the AcAILs by common methods. In order to eliminate the effect of the trace water, the standard addition method (SAM) was applied to these measurements. As a new concept, ionic parachor was put forward. [OAc](-) was seen as a reference ion, and its individual value of ionic parachor was determined in terms of two extrathermodynamic assumptions. Then, the values of ionic parachors of a number of anions, [NTf(2)](-), [Ala](-), [AlCl(4)](-), and [GaCl(4)](-), were obtained by using the value of the ionic parachor of the reference ion; the parachor and surface tension of the investigated ionic liquids in literature were estimated. In comparison, the estimated values correlate quite well with their matching experimental values.