Measurements and molecular interactions for N, N-dimethylformamide with ionic liquid mixed solvents

Pankaj Attri, P. Madhusudan Reddy, P. Venkatesu, Anil Kumar, T. Hofman

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To understand the molecular interactions between N,N-dimethylformamide (DMF) with two families of ionic liquids (ILs), we have measured thermophysical properties such as densities and ultrasonic sound velocities (u) over the whole composition range at 25 °C under atmospheric pressure. The excess molar volume (VE) and the deviation in isentropic compressibilities (δKs) were predicted using these properties as a function of the concentration of IL. These results are fitted to the Redlich-Kister polynomials. The materials investigated in the present study included two families of ILs such as ammonium salts and imidazolium salts. Diethylammonium acetate ([Et2NH][CH3COO], DEAA), triethylammonium actetate ([Et3NH][CH3COO], TEAA), triethylammonium dihydogen phosphate ([Et3NH][H2PO4], TEAP), and triethylammonium sulfate ([Et3NH][HSO4], TEAS) are ammonium salts and 1-benzyl-3-methylimidazolium chloride ([Bmim][Cl]) belongs to the imidazolium family. The intermolecular interactions and structural effects were analyzed on the basis of the measured and the 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 DMF molecules and their structural factors.

Original languageEnglish
Pages (from-to)6126-6133
Number of pages8
JournalJournal of Physical Chemistry B
Issue number18
Publication statusPublished - May 13 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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