Determination of the Quadrupolar Coupling Constant and the Asymmetry Parameter of Oxygen-17 in Acetone by 17O- and 1H-NMR in Nematic Phases
✍ Scribed by Yves Tricot; Werner Niederberger
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- German
- Weight
- 358 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Linear relationships between the inverse of the quadrupolar coupling constant, 1/χ and the asymmetry parameter η are obtained for the ^7^O‐nucleus of acetone oriented in four different nematic phases, using the information contained in ^1^H‐ and ^17^O‐NMR spectra. The absence of a unique intersecting point of thee relations shows that the quadrupolar constants differ slightly between polar and apolar nematic phases, while the orientation remains similar. By combination of the experimentally derived relations with predictions from the theory of Townes and Dailey, values for χ = 11.15 MHz and η = 0.47 in polar media and χ = 11.35 Mhz and η = 0.15 in an apolar medium are obtained, which are similar to those found in the gas and solid phases.