N,N-DIMETHYLFORMAMIDE METHANOL BINARY-MIXTURES AND THEIR ASSUMED INTERNAL STRUCTURES

The H-1-NMR spectra of liquid binary mixtures, N,N-dimethylformamide ( DMF)-methanol (MeOH), were recorded at 298 K within nearly the whole r ange of the mixed solvent compositions. From these data the values of the spectral parameter, Delta delta(DMF-MeOH) were found. The dielectr ic permittivities (epsilon(12)) of the mixed solvents were measured at 288.15 K, 298.15 K, 303.15 K and 308.15 K. From literature values of density (d(12)), viscosity (eta(12)) and measured dielectric permittiv ities the values of molar volumes (V-12), kinematic viscosities (eta(1 2)/d(12)) and their deviations from ''ideality'', at 298.15 K, were ca lculated. Additionally, the values of the temperature coefficients of dielectric permittivity, alpha(12) = (1/epsilon(12)).[d epsilon(12)/d( 1/T)], were found. These structural parameters as functions of concent ration suggest the formation of the ''complexes'' (sub-unit) of the DM F.MeOH type.