STUDY ON THE INTERNAL STRUCTURES OF LIQUID N,N-DIMETHYLFORMAMIDE-PROPANE-1,2-DIOL MIXTURES

The H-1-NMR spectra of the liquid binary mixtures, N,N-dimethylformamide (DMF)-propane-1,2-diol (PD-1,2), were recorded at 298 K within nearly the whole range of the mixed solvent compositions. From these data the values of the spectral parameter, DELTAdelta(DMF-PD-1,2) were found. The densities (d12) and viscosities (eta12) of the mixed solvents were measured at 298 K, as well as the dielectric permittivities (epsilon12) at 288.15 K, 298.15 K and 303.15 K. From all these new parent data, the values of molar volumes (V12), kinematic viscosities (eta12/d12) and their deviations from ''idealty'' were calculated. Additionally, the values of the temperature coefficients of dielectric permittivity, alpha12, were found. These structural parameters as functions of concentration suggest the formation of the most stable ''complexes'' (sub-units) of the DMF.2 PD-1,2 and 3 DMF.2 PD-1,2 types.