STUDIES ON INTERMOLECULAR INTERACTIONS IN LIQUID FORMAMIDE-1-PROPANOL, N,N-DIMETHYLFORMAMIDE-1-PROPANOL AND N,N-DIMETHYLFORMAMIDE--ETHANOL BINARY-MIXTURES

The H-1-NMR spectra of liquid binary mixtures, formamide (F)-1-propano l (PrOH), N,N-dimethylformamide (DMF)-1-propanol and N,N-dimethylforma mide-ethanol (EtOH) were recorded at 298 K within nearly the whole ran ge of the mixed solvent compositions. From these data were found the v alues of the spectral parameters, DELTAdelta(F-PrOH), DELTAdelta(DMF-P rOH) and DELTAdelta(DMF-EtOH). The densities (d12) and viscosities (et a12) of the mixed solvents were measured at 298.15 K, as well as the d ielectric permittivities (epsilon12) at 288.15 K, 298.15 K and 303.15 K. From all these new patent data, the values of molar volumes (V12), kinematic viscosities (eta12/d12) and their deviations from ''ideality ''were calculated. Additionally, the values of the temperature coeffic ients of dielectric permittivity, a,2, were found. These structural pa rameters as functions of concentration suggest the formation of the mo st stable ''complexes'' (sub-units) of the 3F.2PrOH and 2F.PrOH types in the F.PrOH mixtures, DMF.EtOH type in the DMF-EtOH mixtures and DMF .PrOH type in the DMF-PrOH mixtures.