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


P. Madhusudhana Reddy1 and P. Venkatesu1

1University of Delhi, Delhi, India

Keywords: ionic liquid
property: volumetric properties
material: ammonium salts and imidazolium salts

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 (ρ) 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 sulphate ([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.

References
  1. P. Attri, P. M. Reddy, P. Venkatesu, A. Kumar, T. Hofman, J. Phys. Chem. B 114, 6126 (2010).

  2. P. Attri, P. M. Reddy, P. Venkatesu, Ind. J. Chem. 49A, 736 (2010).

  3. P. Attri, P. Venkatesu, A. Kumar, J. Phys. Chem. B 114, 13415, (2010).

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