Determination of the Quadrupolar Coupling Constant and the Asymmetry Parameter of Oxygen-17 in Acetone by17O- and1H-NMR in Nematic Phases
| Autor: | Werner Niederberger, Yves M. Tricot |
|---|---|
| Rok vydání: | 1984 |
| Předmět: |
Oxygen-17
Coupling constant Chemistry media_common.quotation_subject Organic Chemistry Thermodynamics Nuclear magnetic resonance spectroscopy Biochemistry Asymmetry Catalysis Spectral line Inorganic Chemistry Nuclear magnetic resonance Liquid crystal Drug Discovery Proton NMR Polar Physical and Theoretical Chemistry media_common |
| Zdroj: | Helvetica Chimica Acta. 67:1033-1039 |
| ISSN: | 1522-2675 0018-019X |
| DOI: | 10.1002/hlca.19840670416 |
| Popis: | Linear relationships between the inverse of the quadrupolar coupling constant, 1/χ and the asymmetry parameter η are obtained for the 7O-nucleus of acetone oriented in four different nematic phases, using the information contained in 1H- and 17O-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. |
| Databáze: | OpenAIRE |
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