Citation: GONG Yanyan, LIU Haichun, ZHANG Duo, TONG Jing. Thermodynamic Properties of the Ether-Based Functionalized Ionic Liquids [MOEMIm]Cl and [EOEMIm]Cl[J]. Acta Physico-Chimica Sinica, ;2019, 35(11): 1224-1231. doi: 10.3866/PKU.WHXB201901072 shu

Thermodynamic Properties of the Ether-Based Functionalized Ionic Liquids [MOEMIm]Cl and [EOEMIm]Cl

College of Chemistry, Liaoning University, Shenyang 110036, P. R. China

Corresponding author: TONG Jing, tongjinglnu@sina.com
Received Date: 27 January 2019
Revised Date: 28 February 2019
Accepted Date: 8 March 2019
Available Online: 13 November 2019
Fund Project: This project is supported by the National Natural Science Foundation of China (21773100) and "Liaoning BaiQianWan Talents Program", Chinathe National Natural Science Foundation of China 21773100

Functionalized ionic liquids containing ether groups can be obtained through reasonable design. The unique properties of ether-based functionalized ionic liquids are attractive for a variety of practical applications. To further develop these ether-based functionalized ionic liquids, it is important to accurately describe the thermophysical properties of ether-based functionalized ionic liquids and to predict, simulate, and optimize theoretical models of thermophysical properties. Herein, the ether-functionalized ionic liquids [MOEMIm]Cl and [EOEMIm]Cl were characterized by nuclear magnetic resonance spectroscopy, elemental analysis, and thermogravimetric analysis. The density (ρ), surface tension (γ), and refractive index (n_D) of [MOEMIm]Cl and [EOEMIm]Cl were measured at 5 K intervals between 288.15 and 328.15 K. Based on the obtained experimental data, the molar volume (V), molecular volume (V_m), standard entropy (S₍₂₉₈₎⁰), and lattice energy (U_POT) of [MOEMIm]Cl and [EOEMIm]Cl were calculated and the data obtained at 298.15 K were compared. The comparison results agreed well with the literature values within the experimental error range and indicated that both [MOEMIm]Cl and [EOEMIm]Cl exhibit small lattice energies and are in the molten state at room temperature (T = 298.15 K). Based on these experimental data, the molar surface Gibbs free energy (g_s), molar surface entropy (s), molar surface enthalpy (h), molar polarization (R_m), and molar polarizability (α_p) of [MOEMIm]Cl and [EOEMIm]Cl were also calculated. The calculation results show that the molar surface enthalpy (h) is approximately constant, that is, the molar surface constant pressure heat capacity is close to zero, indicating that the process of heat capacity change from the inside to the surface of the ionic liquid is an equivalent coulomb process. Simultaneously, the calculation results showed that the molar polarization (R_m) and molar polarizability (α_p) of the ionic liquids were independent of temperature, indicating that R_m and α_p reflect the induced dipole effect of the ionic liquid. The molar surface Gibbs free energy definition equation was combined with the Lorentz-Lorenz equation to obtain a novel modified Lorentz-Lorenz equation and was used to predict the surface tension of the [MOEMIm]Cl and [EOEMIm]Cl liquids. The values predicted using this combined equation were highly correlated with the experimental values.
- Ether-based functionalized ionic liquid,
- Density,
- Surface tension,
- Gibbs free energy of the molar surface,
- Lorentz-Lorenz equation
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