Thermophysical properties of aqueous solution of ammonium-based ionic liquids

Reddicherla Umapathi, Pankaj Attri, Pannuru Venkatesu

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58 Citations (Scopus)


Experimental densities (I), ultrasonic sound velocities (u), viscosities (I), and refractive indices (nD) of binary mixtures of ammonium-based ionic liquids (ILs) such as diethylammonium acetate (DEAA) [(CH 3CH2)2NH][CH3COO], triethylammonium acetate (TEAA) [(CH3CH2)3NH][CH 3COO], diethylammonium hydrogen sulfate (DEAS) [(CH 3CH2)2NH][HSO4], triethylammonium hydrogen sulfate (TEAS) [(CH3CH2)3NH][HSO 4], trimethylammonium acetate (TMAA) [(CH3) 3NH][CH3COO], and trimethylammonium hydrogen sulfate (TMAS) [(CH3)3NH][HSO4] with water are reported over the wide composition range at 25 °C under atmospheric pressure. The excess molar volumes (VE), deviation in isentropic compressibilities (Δκs), deviation in viscosities (Δη) and deviation in refractive indices (ΔnD) are calculated from experimental values and are correlated by Redlich-Kister polynomial equations. The VE and Δκs values for the aforesaid systems are negative over the entire composition range while the Δη and ΔnD values are positive under the same experimental conditions. The intermolecular interactions and structural effects were analyzed on the basis of measured and derived properties. A qualitative analysis of the results is discussed in terms of the ion-dipole, ion-pair interactions and hydrogen bonding between ILs and water. Furthermore, the hydrogen bonding features between ILs with water were analyzed by using a molecular modeling program with the help of HyperChem7.

Original languageEnglish
Pages (from-to)5971-5982
Number of pages12
JournalJournal of Physical Chemistry B
Issue number22
Publication statusPublished - Jun 5 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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