Dielectric Relaxation of Aliphatic Amines in Cyclohexane Solution

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Abstract
Dielectric constants and losses have been obtained for n-butyl-, n-hexyl-, n-nonyl-, 2-nonyl-, 5-nonyl-, n-decyl-, n-undecyl-, N-methyl-n-octyl-, N, N-dimethyl-n-octyl-, and N, N-diethyl-n-octylamines in cyclohexane solution at 25°C at up to 10 frequencies in the range 1.0–145 GHz. Static dielectric constants have also been measured at 2 MHz. Primary amines are characterized by short relaxation times which are almost independent of the size of the alkyl group and the location of the −NH2 group. Considerably longer values are obtained for the secondary and tertiary amines. The results are discussed in terms of the relative importance of dipole reorientation by intramolecular and whole molecule rotations.