Influence of anion on thermophysical properties of ionic liquids with polar solvent

Varadhi Govinda, P. Madhusudhana Reddy, Pankaj Attri, P. Venkatesu, P. Venkateswarlu

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


In this work, we have reported a series of ionic liquids (ILs) involving a common cation trimethyl ammonium, ([(CH3)3NH] +), with generally used anions (acetate, [CH3COO] -, sulfate, [HSO4]-, phosphate, [H 2PO4]-). To address the molecular interactions between the relatively new class of solvents such as trimethylammonium acetate [(CH3)3NH+] [CH3COO-] (TMAA), trimethylammonium hydrogen sulfate [(CH3)3NH +][HSO4-] (TMAS), and trimethylammonium dihydrogen phosphate [(CH3)3NH+][H 2PO4-] (TMAP), with the polar solvent, dimethylsulfoxide (DMSO), the density (ρ), speed of sound (u) and viscosity (η) values have been measured over complete concentration range and wide temperature range from 298.15 K to 313.15 K in steps of 5 K under ambient pressure. By using these experimental results, excess volumes (VE), isentropic compressibility deviations (Δκs) and viscosity deviations (Δη) were obtained for all these binary systems at all experimental temperatures. The results are correlated by the Redlich-Kister type function to derive the coefficients and estimate the standard error. Further, the results for observed anion dependent phenomena and temperature influence on measured and derived properties are also discussed.

Original languageEnglish
Pages (from-to)269-278
Number of pages10
JournalJournal of Chemical Thermodynamics
Publication statusPublished - 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Physical and Theoretical Chemistry


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