Single-frequency measurement of double-relaxation times of mono-substituted anilines in benzene

Abstract

Single-frequency measurements of dielectric relaxation parameters at different concentrations are used to estimate the double-relaxation times tau 1 (smaller) and tau 2 (larger) of some mono-substituted anilines in benzene at 35 degrees C for 2.02, 3.86 and 22.06 GHz electric fields respectively. The o- and m-anisidines like p-toluidines exhibit double-relaxation phenomena at 3.86 and 22.06 GHz whereas o- and m-toluidines show the same effect at 2.02 and 3.86 GHz respectively. Only p-anisidine, however, shows the mono-relaxation behaviour at all frequencies. The relative contributions C1 and C2 towards dielectric relaxation for tau 1 and tau 2 are computed from Frohlich's equations only for comparison with those of the graphical techniques adopted here. The dipole moments mu 1 and mu 2 in terms of tau 1 and tau 2 are then determined from the slope beta of concentration variation of the ultra-high-frequency conductivity Kij for those compounds to establish their conformations.