Microwave Absorption and Molecular Structure in Liquids. LXVIII. Dielectric Behavior at 2.2-mm Wavelength and Intramolecular Motion in Five Substituted Benzenes and Cyclohexanes
- 1 January 1967
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 46 (1) , 373-377
- https://doi.org/10.1063/1.1840397
Abstract
The dielectric constants and losses of anisole, bromocyclohexane, aniline, N,N‐dimethylaniline, and cyclohexanol in the pure liquid state have been measured at 2.2 mm wavelength at temperatures between 20° and 60° and combined with data in the literature to calculate the dielectric relaxation times. Where additional data were needed, measurements were made at wavelengths of 1.2, 3.2, 10.0, and 575 000 cm. A single relaxation region was found for bromocyclohexane, corresponding to dipole orientation by molecular rotation, while cyclohexanol showed three relaxation times like those found for aliphatic alcohols, a long one associated with the hydrogen‐bonded structure of the liquid, an intermediate one presumably corresponding to molecular rotation, and a short one corresponding to hydroxyl‐group rotation. Anisole gave two relaxation times, one for molecular rotation and one for methoxy‐group rotation. Aniline and N,N‐dimethylaniline gave two relaxation times, one of the magnitude to be expected for molecular rotation and one so much shorter than the second and shorter relaxation time of anisole as to suggest its association with a molecular‐inversion process.Keywords
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