The study of molecular interactions in 1-ethyl-3-methylimidazolium trifluoromethanesulfonate + 1-pentanol from density, speed of sound and refractive index measurements

M. Srinivasa Reddy, Imran Khan, K. Thomas S.S. Raju, P. Suresh, B. Hari Babu

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A molecular interaction study is carried out between the ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate and 1-pentanol using the experimental values of density, speed of sound and refractive index measurements over the whole composition range as a function of temperature between (298.15 and 328.15) K at atmospheric pressure. The excess/deviation properties, such as molar volumes VmE, partial molar volumes (V¯mE), partial molar volumes at infinite dilution V¯mE,∞, isentropic compressibility KsE, free length (LfE, speeds of sound (uE), refractive index (ΔPdblnD) and isobaric thermal expansion coefficient (αPE) obtained from the experimental values are fitted into the Redlich-Kister type equation to obtain the binary coefficients and the standard deviations. The negative values of excess properties such as VmE, KSE, LfE, αPE and the positive values of uE, ΔPdblnD clearly indicated the existence of strong molecular interactions between the studied components. The values of (∂VmE/∂T)Pand (∂HmE/∂P)T are also calculated to support the existing interactions. A quantitative analysis of these parameters is further supported by IR spectroscopic analysis.

Original languageEnglish
Pages (from-to)298-308
Number of pages11
JournalJournal of Chemical Thermodynamics
Publication statusPublished - Jul 1 2016



  • 1-Pentanol
  • Density
  • Excess/deviation properties
  • Refractive index
  • Speed of sound
  • [Emim][Triflate]

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Physical and Theoretical Chemistry

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