Dielectric relaxation studies of dilute solutions of amides

The dielectric constants and dielectric losses of formamide, acetamide, N-methyl acetamide, acetanilide and N,N-dimethyl acetamide in dilute solutions of 1,4-dioxan/benzene have been measured at 308 K using 9.37 GHz, dielectric relaxation set up. The relaxation time for the over all rotation τ(1) and that for the group rotation τ(2) of (the molecules were determined using Higasiʹs method. The activation energies for the processes of dielectric relaxation and viscous flow were determined by using Eyringʹs rate theory. From relaxation time behaviour of amides in non-polar solvent, solute–solvent and solute–solute type of molecular association is proposed.