Effect of the temperature on the physical properties of pure 1-propyl 3-methylimidazolium bis(trifluoromethylsulfonyl)imide and characterization of its binary mixtures with alcohols

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• 作者：Elena Gó ; mez^a ;   ; ^{elenagc@uvigo.es} ; Noelia Calvar^b ; Eugé ; nia A. Macedo^b ; Á ; ngeles Dom&#237 ; nguez^a
• 关键词：[PMim][NTf₂] ; Density ; Viscosity ; Refractive index ; Alcohols
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2012
• 出版时间：February 2012
• 年：2012
• 卷：45
• 期：1
• 页码：9-15
• 全文大小：386 K

文摘

In this paper, physical properties of a high purity sample of the ionic liquid 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [PMim][NTf₂], and its binary mixtures with methanol, ethanol, 1-propanol, and 2-propanol were measured at atmospheric pressure. The temperature dependence of density, refractive index and speed of sound (293.15 to 343.15) K and dynamic viscosity (298.15 to 343.15) K were studied at atmospheric pressure by conventional techniques for the pure ionic liquid. For its mixtures with alcohols, density, speed of sound, and refractive index were measured at T = 298.15 K over the whole composition range. The thermal expansion coefficient of the [PMim][NTf₂] was calculated from the experimental results using an empirical equation, and values of the excess molar volume, excess refractive index, and excess molar isentropic compressibility for the binary systems at the above mentioned temperature, were calculated and fitted to the Redlich¨CKister equation. The heat capacity of the pure ionic liquid at T = 298.15 K was determined using DSC.