Temperature dependence measurements and molecular interactions for ammonium ionic liquid with N-methyl-2-pyrrolidone

T. Kavitha, Pankaj Attri, Pannuru Venkatesu, R. S. Rama Devi, T. Hofman

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We report the synthesis and characterisation of a series of ammonium ionic liquids (ILs) containing acetate and sulphate anions with alkyl ammonium cation. To understand the thermophysical properties of these synthesised ILs with polar solvent N-methyl-2-pyrrolidone (NMP), precise measurements such as densities (ρ), speed of sound (u), and viscosity (η) over the entire mole fraction range have been measured at 5 K intervals within the temperature range of (298.15 to 313.15) K under atmospheric pressure. The excess molar volume (V E), the deviation in isentropic compressibility (Δκ s), and deviation in viscosity (Δη) were predicted using these temperature dependence properties as a function of the concentration of ILs. The Redlich-Kister polynomial was used to correlate the results. The ILs investigated in the present work included diethylammonium acetate (DEAA) [(CH 3CH 2) 2NH][CH 3COO], triethylammonium acetate (TEAA) [(CH 3CH 2) 3NH][CH 3COO], diethylammonium hydrogen sulphate (DEAS) [(CH 3CH 2) 2NH][HSO 4], and triethylammonium hydrogen sulphate (TEAS) [(CH 3CH 2) 3NH][HSO 4]. The intermolecular interactions and structural effects were analysed on the basis of the measured and the derived properties. The information reported here in terms of ion-dipole interactions, ion-pair interactions and hydrogen bonding between ILs and NMP, elucidates the influences of ions and also the temperature effects on the thermophysical properties.

Original languageEnglish
Pages (from-to)223-237
Number of pages15
JournalJournal of Chemical Thermodynamics
Publication statusPublished - Nov 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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