Microwave Absorption and Molecular Structure in Liquids. LXXIX. Dielectric Behavior and Association of Some Normal Alcohols in n-Heptane Solution
- 1 November 1972
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 57 (9), 3977-3986
- https://doi.org/10.1063/1.1678870
Abstract
Dielectric constants and losses at 25°C of 1‐butanol, 1‐hexanol, 1‐heptanol, and 1‐decanol, each at six concentrations from 0.03 to 0.3 mole fraction in n‐heptane, have been measured at wavelengths from 2 mm to 600 m. At the lower concentrations, the dielectric absorption may be resolved into two dispersion regions, characterized by relaxation times τ3 ( ≈ 3 psec and almost concentration independent) and τ2 (ranging from 25 to 100 psec and concentration dependent). The latter dispersion increases its contribution relative to the former with increasing alcohol concentration. At the higher concentrations a final process with a long relaxation time, τ1 (strongly concentration dependent), appears. This third process corresponds to the principal low‐frequency dispersion already well characterized in pure primary normal aliphatic alcohols. The high‐frequency process, because of its very short relaxation time, is attributed to rotation of the hydroxyl group about its C–O bond, the intermediate process is related to the reorientation of the monomer and possibly small multimers or a polymer chain segment, such as an ‐OR group rotating about its bond, while the low‐frequency process involves hydrogen‐bonded structures of some considerable size.Keywords
This publication has 19 references indexed in Scilit:
- Microwave Absorption and Molecular Structure in Liquids. LXXVIII. Dielectric and Association Behavior of Six Isomeric Octyl Alcohols in n-Heptane SolutionThe Journal of Chemical Physics, 1971
- Microwave absorption and molecular structure in liquids. LXXVI. Relaxation behavior of several primary alcohols in dilute benzene and p-dioxane solutionsJournal of the American Chemical Society, 1969
- Dielectric behavior of mixtures of 1-heptanol and 4-heptanol and the fluid structure of the monoalcoholsThe Journal of Physical Chemistry, 1969
- Microwave Absorption and Molecular Structure in Liquids. LXVIII. Dielectric Behavior at 2.2-mm Wavelength and Intramolecular Motion in Five Substituted Benzenes and CyclohexanesThe Journal of Chemical Physics, 1967
- Microwave Absorption and Molecular Structure in Liquids. LXII. The Three Dielectric Dispersion Regions of the Normal Primary Alcohols1The Journal of Physical Chemistry, 1965
- NMR Studies of Hydrogen Bonding in Alcohols and PhenolThe Journal of Chemical Physics, 1959
- Nuclear magnetic resonance studies of hydrogen bonding in ethanolJournal of Molecular Spectroscopy, 1958
- Study of Hydrogen Bonding in Systems of Hydroxylic Compounds in Carbon Tetrachloride through the Use of NMRThe Journal of Chemical Physics, 1958
- Dielectric Properties of Liquid Ethanol and 2-PropanolThe Journal of Chemical Physics, 1955
- Molecular Rotation in the Solid Forms of Some Long-Chain AlcoholsJournal of the American Chemical Society, 1949