Density, Speeds of Sound, and Refractive Index of Pure and Binary Mixtures of Ionic Liquids Based on Imidazolium Cations and Tetrafluoroborate Anions with Cyclohexylamine,Journal of Chemical & Engineering Data

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Density, Speeds of Sound, and Refractive Index of Pure and Binary Mixtures of Ionic Liquids Based on Imidazolium Cations and Tetrafluoroborate Anions with Cyclohexylamine
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2021-09-12 , DOI: 10.1021/acs.jced.1c00419
Zubin Master ₁ , Naved I. Malek ₁

Affiliation

Conventionally used volatile organic solvents in various industrial processes are recently replaced by ionic liquids (ILs) in their pure form and their mixture with suitable cosolvents. In a quest to tune the thermophysical properties of the pure ILs through mixing with the organic solvents, in the present investigation, we had measured the density (ρ), speeds of sound (u), and refractive index (n_D) of pure ILs with imidazolium cations and tetrafluoroborate anions and their mixture with cyclic amine, cyclohexylamine, over the entire composition range and temperatures ranging from 293.15 to 323.15 K and at atmospheric pressure. Various thermodynamic and acoustic properties such as excess molar volume (V_m^E), excess molar isentropic compressibility (K_s,m^E), and deviation in refractive index (Δ_ϕn_D) have been determined and used to interpret the molecular interaction within the components of the mixture. Investigation was carried out to understand the nonideal behavior of the mixture, and the influence of the alkyl chain and temperature was reported. The experimentally obtained refractive index is correlated with the theoretically calculated refractive index through several mixing rules. Finally, the experimentally calculated V_m^E values were compared with the V_m^E predicted through Prigogine–Flory–Patterson (PFP) theory and the extended real association model. Results of the present investigation give useful insights into fine-tuning the thermophysical properties of ILs for their specialized applications.

中文翻译：

基于咪唑鎓阳离子和四氟硼酸阴离子与环己胺的纯离子液体和二元混合物的密度、声速和折射率

各种工业过程中常规使用的挥发性有机溶剂最近被纯离子液体 (IL) 及其与合适助溶剂的混合物所取代。为了通过与有机溶剂混合来调整纯离子液体的热物理性质，在本研究中，我们测量了纯离子液体的密度 (ρ)、声速 ( u ) 和折射率 ( n _D )与咪唑鎓阳离子和四氟硼酸根阴离子以及它们与环胺、环己胺的混合物，在整个组成范围内，温度范围为 293.15 至 323.15 K，在大气压下。各种热力学和声学特性，例如过量摩尔体积 ( V _m^E)、过量摩尔等熵压缩率 (K _s,m^E ) 和折射率偏差 (Δ _ϕn _D ) 已被确定并用于解释混合物组分内的分子相互作用。进行了调查以了解混合物的非理想行为，并报告了烷基链和温度的影响。通过几种混合规则，实验获得的折射率与理论计算的折射率相关。最后，通过实验计算的V_米^Ë值与所比较的V_米^ë通过 Prigogine-Flory-Patterson (PFP) 理论和扩展的真实关联模型预测。本研究的结果为微调 IL 的热物理特性提供了有用的见解，以用于其专门应用。

更新日期：2021-10-14

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