Excess Thermodynamic Properties for Binary Mixtures of Ionic Liquid 1-Ethyl-3-methylimidazolium Ethyl Sulfate and 2-Methoxyethanol from T = (298.15 to 328.15) K at Atmospheric Pressure

M. Srinivasa Reddy, K. Thomas S.S. Raju, Sk Md Nayeem, Imran Khan, K. B.M. Krishana, B. Hari Babu

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The density (ρ), speed of sound (u) and refractive index (nD) for pure [Emim][EtSO4], 2-methoxyethanol and their binary mixtures were measured using an Anton Paar vibrating tube density and sound velocity meter (DSA 5000 M) and automatic refractometer over the whole composition range as a function of temperature between 298.15 and 328.15 K in steps of 10 K at atmospheric pressure. Experimental values were used to calculate the excess values of molar volumes (Vm E), partial molar volumes (V¯ m E), partial molar volumes at infinite dilution (V¯ m E, ∞), isentropic compressibility (κSE), acoustic impedance (ZE), free length (Lf E), speeds of sound (uE), internal pressure (πiE), free volume (Vf E) and deviations in refractive index (Δ ϕ nD) for the binary mixtures. These properties were fitted to a Redlich–Kister type equation to obtain the binary coefficients and the standard deviations. The negative values of Vm E, κSE, Lf E,αpE, and Vf E and positive values for ZE, uE,πiE, and Δ ϕ nD indicate the existence of strong interactions between the components. This was further supported by IR spectroscopy analysis.

Original languageEnglish
Pages (from-to)675-701
Number of pages27
JournalJournal of Solution Chemistry
Issue number5
Publication statusPublished - May 1 2016



  • 2-Methoxyethanol
  • Density
  • Excess/deviation parameters
  • Refractive index
  • Speed of sound
  • [Emim][EtSO]

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Physical and Theoretical Chemistry

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