Ermittlung der anisotropen brown'schen rotation monosubstituierter diphenyle in flüssiger phase durch 13CTfl-messungen
✍ Scribed by K.-L. Oehme; G. Rudakoff; R. Radeglia
- Publisher
- Elsevier Science
- Year
- 1976
- Weight
- 820 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0001-8716
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✦ Synopsis
Measurements
of spin lattice '3C-relaxation times of protonated carbon atoms in monosubstituted diphenyls are described. It was possible to obtain the various T,-times as a function of the anisotropic Brownian rotation by application of Woessner's theory. Two diffusion rates for the "overall" motion were derived from the T,-values.
It was ascertained that the anisotropy of rotation is fundamentally greater than the theoretical value, owing to the mass moments of inertia. This is caused by the very high "frictional effect" on the C&-rotation. The intramolecular rotation of the phenyl group was determined by two models of motion. * Ausfiihrliche Diskussion der Relaxationsmechanismen siehe Noack [8], Farrar et al. [9] und Levy et al. [lo]!