## Abstract The dielectric increments of homologous series of bromides, fatty and dicarboxylic acids in different solvents are measured. The possibility of calculating the dipole moments is examined. It is necessary to apply corrections which depend on the volume of the solute molecules and on thei
Dielektrische Messungen an polaren Gemischen. 6. Mitteilung Harnstoffe
✍ Scribed by Tino Gäumann
- Publisher
- John Wiley and Sons
- Year
- 1958
- Tongue
- German
- Weight
- 784 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The dielectric increments of substituted ureas in polar solvents are measured. The dipole moments and the correlation parameters are calculated and discussed. It is shown that the results are only explainable if cis‐conformation of the alkyl substituent to the carbonyl group and a hydrogen bridge to the solvent are assumed. The frequency dependence of some solutions is measured and the relaxation times are calculated. It is possible to construct COLE‐arc‐plots for the solute from the real and the imaginary part of the increment. Measurements of the temperature dependence of the dielectric constant of tetraethyl‐urea shows the normal behaviour of a liquid without hydrogen bridges and without free rotation in the solid.
📜 SIMILAR VOLUMES
## Abstract The dielectric properties of solutions of ω‐aminoacids in mixed solvents are compared with the properties calculated for a simple model. As a model representing the dissolved dipolar ion a system of concentric spheric shells was assumed. The inner sphere with a central microscopic dipol
## Abstract Die dielektrischen Inkremente von Harnstoff, Glycin, (β‐Alanin) ϵ‐Aminocapronsäure und ϑ‐Aminopelargonsäure wurden in Wasser–Dioxan‐ und Wasser–Äthanol‐Gemischen gemessen und qualitativ diskutiert. Die Aminosäuren zeigen eine um so stärkere Abnahme mit sinkender Dielektrizitätskonstante
## Abstract The frequency dependence of the conductivity of dicarboxylic acids in methylcellosolve is measured, and by means of a simplified model a relaxation time calculated. This relaxation time is discussed in relation to free rotation.
## Abstract Es wird mit Hilfe der Elektrostatik der Kontinua und einer Reihe von vereinfachenden Voraussetzungen ein Ausdruck für die freie Energie eines binären Lösungsmittelgemisches, das unipolare Ionen enthält, aufgestellt. Die Lösung, die mittels Variationsrechnung und eines Grenzüberganges fü
## Abstract The dielectric behaviour of liquid and solid phases of cyclopentanone, cyclohexanone, cycloheptanone and cyclodecanone has been investigated at frequencies below 300 kcps. It has been found that cyclopentanone and cyclodecanone show a very sharp decrease of the dielectric constant at th