MICROWAVE ABSORPTION AND MOLECULAR STRUCTURE IN LIQUIDS .75. RELAXATION PROCESSES OF SEVERAL LONG-CHAIN ALIPHATIC MOLECULES IN N-HEPTANE SOLUTIONS

The dielectric constants and losses of di-n-butyl ether, n-dodecyl methyl ether, n-octylaldehyde, n-octylamine, n-octyl bromide, and n-octanone-2 have been measured at 0.2, 1.2, 3.2, 9.9, 24.8, and 49.8 cm wavelengths at several concentrations in n-heptane solution at 25°. Asymmetric plots for dielectric loss against dielectric constant are found for di-n-butyl ether, n-dodecyl methyl ether, n-octylaldehyde, and n-octylamine. n-Octyl bromide and n-octanone-2 show symmetrical depressed center arcs. Analyses in terms of two relaxation times for the first four compounds yield consistent parameters for molecular and intramolecular rotation. n-Octyl bromide and n-octanone-2 are more reasonably described in terms of a distribution of relaxation times. © 1969, American Chemical Society. All rights reserved.