利用核磁共振扩散仪研究 1-丁基-1-甲基吡咯烷鎓双(三氟甲基磺酰基)亚胺离子液体的分子迁移率

IF 1.1 4区 物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
Konstantin V. Tyutyukin, Alexandr V. Ievlev, Vladimir V. Matveev, Luis M. Varela, Oscar Cabeza
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引用次数: 0

摘要

本文介绍了对离子液体(IL)1-丁基-1-甲基吡咯烷鎓双(三氟甲基磺酰基)亚胺(BmpyrTFSI)的核磁共振(NMR)研究。BmpyrTFSI 是最常用的电解质之一,既可以是纯液体,也可以与其他溶剂和盐类结合使用。我们通过核磁共振扩散研究了它的物理化学特性,这使我们能够独立测量阴离子和阳离子的自扩散系数:bmpyr+ 阳离子的自扩散系数为 1H,TFSI 阴离子的自扩散系数为 19F,两种离子的自扩散系数均为 13C。测试液体的纯度通过核磁共振光谱进行了验证,结果表明在 1H 和 13C 核的光谱中没有杂质线。在 243 至 333 K 的温度范围内测量了阳离子和阴离子的自扩散系数,用于研究离子的迁移率,并与离子电导率进行比较。所有的扩散衰减都是由单一成分描述的;我们可以得出结论,在我们的系统中既没有观察到离子对,也没有观察到更复杂的聚集体。我们认为,电导率完全由离子的自扩散决定。此外,我们还考虑了我们的数据与有关自扩散系数对粘度值和离子电导率的温度依赖性的文献数据的一致性。结果表明,斯托克斯-爱因斯坦关系对这种离子交换树脂的分子流动性描述不佳。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Molecular Mobility Study of 1-Butyl-1-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Ionic Liquid by NMR Diffusometry

Molecular Mobility Study of 1-Butyl-1-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Ionic Liquid by NMR Diffusometry

Nuclear magnetic resonance (NMR) investigations of the ionic liquid (IL) 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BmpyrTFSI) are presented. BmpyrTFSI is one of the most commonly used electrolytes, either as a pure liquid or in combination with other solvents and salts. We have studied its physicochemical properties by NMR diffusion, which allows us to measure independently the self-diffusion coefficients of both anions and cations: 1H for the bmpyr+ cation, 19F for the TFSI anion and 13C for both ions. The purity of the test liquid was verified by NMR spectroscopy and it was shown that there were no impurity lines in the spectra on the 1H and 13C nuclei. Self-diffusion coefficients of the cation and anion were measured in the temperature range of 243 to 333 K, which were used to study the mobility of the ions for comparison with the ionic conductivity. All the diffusion attenuations are described by a single component; we can conclude that neither ion pairs nor more complex conglomerates are observed in our system. We believe that the conductivity is completely determined by the self-diffusion of the ions. In addition, the agreement of our data with literature data on the temperature dependence of self-diffusion coefficients on the values of viscosity and ionic conductivity is considered. It is shown that the Stokes–Einstein relation is a poor description of the molecular mobility of this IL.

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来源期刊
Applied Magnetic Resonance
Applied Magnetic Resonance 物理-光谱学
CiteScore
1.90
自引率
10.00%
发文量
59
审稿时长
2.3 months
期刊介绍: Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.
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