Densities and Viscosities of Binary Mixtures of 2-Ethyl-1,1,3,3-tetramethylguanidinium Ionic Liquids with Ethanol and 1-Propanol

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• 作者：Xiaoxing Lu ; Di Wu ; Dengfeng Ye ; Youping Wang ; Yongsheng Guo ; Wenjun Fang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：September 10, 2015
• 年：2015
• 卷：60
• 期：9
• 页码：2618-2628
• 全文大小：566K
• ISSN：1520-5134

文摘

Two guanidinium-based ionic liquids (ILs), 2-ethyl-1,1,3,3-tetramethylguanidinium bis(trifluoromethylsulfonyl)imide ([TMGEt][NTf₂]) and ethyl sulfate ([TMGEt][C₂OSO₃]) were synthesized and characterized. Experimental densities and viscosities for the binary mixtures of the ILs with ethanol and 1-propanol from (293.15 to 323.15) K were measured over the whole composition range and at the atmospheric pressure of 0.1 MPa. The excess molar volumes (V_m^E) and the viscosity deviations (螖畏) for the binary systems were calculated and fitted with the Redlich鈥揔ister equation. It is found that the density of [TMGEt][NTf₂] is much higher than that of [TMGEt][C₂OSO₃] at the same temperature, while the viscosity of the former with the value of 74.61 mPa路s is only ¹/₉ of that of the latter at 293.15 K. This indicates that the difference of the anions has a significant influence on the density and viscosity of the ILs with the same guanidinium cation. The addition of ethanol or 1-propanol leads to negative values of V_m^E and 螖畏, which result from the efficient packing of the constituents in the binary mixtures and the weakening of anion鈥揷ation interactions of the ILs. The partial molar volumes, excess partial molar volumes, Gibbs energy, and excess Gibbs energy of activation for viscous flow of the binary mixtures also have been calculated. It is hoped that the results provide useful information for the fundamental physicochemical properties of the guanidinium-based ILs and their further applications.