Deuteron NMR spectrum of ND4VO3 and some other ammonium compounds
| Autor: | Z. T. Lalowicz, Matti Punkkinen, Eero Ylinen, L.P. Ingman, E. Koivula, S. F. Sagnowski |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Stereochemistry Carbon-13 NMR satellite Analytical chemistry General Physics and Astronomy Nuclear magnetic resonance spectroscopy Activation energy Atmospheric temperature range Spectral line chemistry Deuterium Kinetic isotope effect Physical and Theoretical Chemistry Inorganic compound |
| Zdroj: | Chemical Physics Letters. 192:590-594 |
| ISSN: | 0009-2614 |
| DOI: | 10.1016/0009-2614(92)85521-b |
| Popis: | Deuteron NMR absorption line shape and its temperature dependence were studied in ND 4 VO 3 especially in the temperature range from 60 to 90 K, where the only molecular motion important for NMR is the reorientation about one threefold axis of ND 4 . Computer fits of the model by Lalowicz and Sagnowski to our experimental spectra gave the activation energy E a = 8.3 kJ/mol. Besides ND 4 VO 3 the low-symmetry samples (ND 4 ) 2 Cr 2 O 7 , (ND 4 ) 2 Ce(NO 3 ) 6 and ND 4 ClO 4 have, above the line-width transition region, a doublet as their absorption curve, which gradually narrows to a single line with a rising temperature. Various contributions to the magnitude of the doublet separation are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|