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-dimethylformami de (DMF)-propane-1,2-diol (PD-1,2), were recorded at 298 K within near ly the whole range of the mixed solvent compositions. From these data the values of the spectral parameter, DELTAdelta(DMF-PD-1,2) were foun d. The densities (d12) and viscosities (eta12) of the mixed solvents w ere measured at 298 K, as well as the dielectric permittivities (epsil on12) at 288.15 K, 298.15 K and 303.15 K. From all these new parent da ta, the values of molar volumes (V12), kinematic viscosities (eta12/d1 2) and their deviations from ''idealty'' were calculated. Additionally , the values of the temperature coefficients of dielectric permittivit y, alpha12, were found. These structural parameters as functions of co ncentration suggest the formation of the most stable ''complexes'' (su b-units) of the DMF.2 PD-1,2 and 3 DMF.2 PD-1,2 types.