Citation: WEI Jie, DONG Hexin, CHEN Xia, YANG Yuxuan, FANG Dawei, GUAN Wei, YANG Jiazhen. Physicochemical Properties of 1-Methoxyethyl-3-Methylimidazolium Glycine[J]. Acta Physico-Chimica Sinica, ;2018, 34(8): 927-932. doi: 10.3866/PKU.WHXB201801112 shu

Physicochemical Properties of 1-Methoxyethyl-3-Methylimidazolium Glycine

Institute of Rare and Scattered Elements, College of Chemistry, Liaoning University, Shenyang 110036, P. R. China

Corresponding author: FANG Dawei, davidfine@163.com GUAN Wei, guanweiy@sina.com
Received Date: 25 December 2017
Revised Date: 9 January 2018
Accepted Date: 9 January 2018
Available Online: 11 August 2018
Fund Project: The project was supported by the National Natural Science Foundation of China (21673107, 21373005, 21703090)The project was supported by the National Natural Science Foundation of China 21673107The project was supported by the National Natural Science Foundation of China 21703090The project was supported by the National Natural Science Foundation of China 21373005

Because of the unique acid-base behavior of amino acids, we combined glycine as the anion with an ether group as the cation and prepared a novel ionic liquid (IL), 1-methoxyethyl-3-methylimidazolium glycine [MOEMIM][Gly]. The formation of this IL was confirmed by ¹H-NMR, ¹³C-NMR, differential scanning calorimetry (DSC) and thermogravimetry (TG) analyses. The density, ρ, and surface tension, γ, of the ILs were measured in the temperature range from 298.15 K to 338.15 K at intervals of 5 K using the standard addition method, because the strong hydrogen bonds between the IL [MOEMIM][Gly] and trace amounts of water made it, extremely difficult to remove water by convention methods. The calculated molar volume, V_m, of [MOEMIM][Gly] increased with increasing temperature. The thermal expansion coefﬁcient, α, was also obtained based on the density values. In terms of the molar surface Gibbs free energy, g_s for [MOEMIM][Gly], the traditional Etvs equation is improved so that it has physical signiﬁcance, that is, the intercept C₀ represents molar surface enthalpy, h, which is a temperature-independent constant and the slop C₁ = −(\begin{document}$\partial $\end{document}g_s/\begin{document}$\partial $\end{document}T)_p is molar surface entropy, s, it shows that modified Etvs equation is not only an empirical equation, but also a strict thermodynamic one. In addition, by a combination of g_s and the modified Etvs equation, the surface tension values of [MOEMIM][Gly] were estimated and compared with the experimental values; both sets of data were in good accordance with each other.
- 1-Methoxyethyl-3-methy limidazolium glycine,
- Density,
- Surface tension,
- Molar surface Gibbs free energy
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