Temperature and Alkyl Chain Dependence of Physicochemical Properties of Pyrrolidinium‑ and Imidazolium-Based Ionic Liquids

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-18 DOI:10.1007/s10953-023-01358-0

Abdullah Aljasmi, Adel S. AlJimaz, Khaled H. A. E. AlKhaldi, Mohammad S. AlTuwaim, Meshal F. Alhasan, Abdulaziz Alnajjar

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Abstract

At temperatures ranging from 293.15 to 343.15 K and atmospheric pressure, the densities, refractive indices, dynamic viscosities, surface tensions, and sound speeds for [Cnmpyr][[NTf₂] (n = 3,4,6,8), [Cnmpyr][[N(CN)₂] (n = 3,4), [Cnmim][[N(CN)₂] (n = 2,4) and [Bnzmim][[N(CN)₂] were measured and discussed. As expected, all properties decrease as the temperature rises, with dynamic viscosity being the property most affected by the temperature change. Using linear correlation as a function of temperature, the density, speed of sound, surface tension, and refractive index are calculated, whereas the dynamic viscosity is correlated using the well-known Vogel–Fulcher–Tamman (VFT) equation. Using the experimental density data, the corresponding coefficients of thermal expansion were calculated. Furthermore, the Laplace–Newton equation was utilized to determine the isentropic compressibility. Results unveiled that the type of anions has the higher influence on the physical properties of the studied ionic liquids, while the elongation of the alkyl chain is less significant.

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吡咯烷鎓和咪唑鎓离子液体理化性质的温度和烷基链依赖性

在温度为 293.15 至 343.15 K 和大气压力下，测量并讨论了[Cnmpyr][[NTf2]（n = 3,4,6,8）、[Cnmpyr][[N(CN)2]（n = 3,4）、[Cnmim][[N(CN)2]（n = 2,4）和[Bnzmim][[N(CN)2]]的密度、折射率、动态粘度、表面张力和声速。不出所料，所有特性都随着温度的升高而降低，其中动态粘度是受温度变化影响最大的特性。利用温度函数的线性相关关系，可以计算出密度、声速、表面张力和折射率，而动态粘度则是利用著名的 Vogel-Fulcher-Tamman (VFT) 公式计算出来的。利用实验密度数据计算了相应的热膨胀系数。此外，还利用拉普拉斯-牛顿方程确定了等熵可压缩性。结果表明，阴离子的类型对所研究的离子液体的物理性质影响较大，而烷基链的伸长率影响较小。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.