Hydrogen bond analysis in alcohol (1-Propanol, 2-Propanol and Glycerol)-DMF mixtures based on dielectric spectroscopy

• The combination of Luzar model and the excess inverse permittivity.
• Deeper understanding of relaxation acts.
• Molecular interaction.

Dielectric properties of Propanol-DMF, and Glycerol-DMF mixtures at full concentrations have been obtained by the dielectric relaxation spectroscopy method at frequency from 20 MHz to 20 GHz at room temperature. The mixture behavior is described by the Davidson-Cole model using four parameters that relate to molecular structure. The hydrogen bond (HB) numbers and binding energies between two pairs (solute–solute and solute-solvent pairs) are estimated by Luzar model, also the type of dipolar ordering which depends on the extent of DMF is obtained. The combination of the excess inverse permittivity and the Luzar model gives a satisfactory explanation and valuable insights into the underlying of the relaxation acts. The binding energy of solute–solute (E11) and solute-solvent (E12) both decrease with the increased number of hydroxyl in mixture system.