1966 Volume 39 Issue 10 Pages 2160-2168
A brief description is made of the experimental methods for measuring microwave dielectric constants and losses of solutions in the frequency range 10–50 Gc./sec. Dielectric data obtained in this experiment were analysed from the viewpoint of molecular interaction between the solute and the solvent molecules. Six benzene derivatives with the amino group, aniline (A), N,N′-di-methylaniline (B), N,N′-diethylaniline (C), 2, 6-dimethylaniline (D), p-nitroaniline (E) and N-methylaniline (F) were chosen as solutes. Benzene and dioxane were used as solvents. The relaxation times of A, D and E obtained in dioxane are about three or five times larger than the corresponding relaxation times in benzene. The relaxation times of B and G in dioxane were about twice or one and half of the corresponding values obtained in benzene. The dielectric behavior of F is intermediate between A and B. These results are attributable to the hydrogen-bond formation between an oxygen atom of the dioxane molecule and an amino-hydrogen atom (F) or atoms (A, D and E).
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