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From Ultraslow to Extremely Fast Dynamics in Sodium Nitrate : an O-17 NMR Study

Title data

Beerwerth, Joachim ; Siegel, Renée ; Hoffmann, Lars ; Plaga, Leonie S. ; Storek, Michael ; Bojer, Beate ; Senker, Jürgen ; Hiller, Wolf ; Boehmer, Roland:
From Ultraslow to Extremely Fast Dynamics in Sodium Nitrate : an O-17 NMR Study.
In: Applied Magnetic Resonance. Vol. 51 (July 2020) Issue 7 . - pp. 597-620.
ISSN 1613-7507
DOI: https://doi.org/10.1007/s00723-020-01201-5

Abstract in another language

Increasing dynamics in solids featuring nuclei subjected to second-order quadrupolar interactions lead to central-transition spectra that undergo two consecutive line-shaped transitions. Conventional motional narrowing occurs when the molecular exchange rate is on the order of the strength of the dominant interaction. In a second step, the resulting intermediately narrowed spectra change further when the motion becomes faster than the Larmor precession rate, leading to terminally narrowed spectra that can display a residual quadrupolar shift. We derive analytic expressions for this shift and analyze the quadrupolar central-transition spectra in terms of C-N symmetrical cone models. Increasing the number of sites to N >= 3, the terminally narrowed spectra remain unaltered, while the intermediately narrowed spectra remain unaltered only for N >= 5. This finding relates to the different (cubic vs. icosahedral) symmetries that are required to average out the spatial second- and fourth-rank terms in the second-order quadrupolar interaction. Following recent work (Hung et al., Solid State Nucl Magn Reson 84:14-19, 2017), O-17 NMR is applied to examine the three-site rotation of the nitrate group in NaNO3. Line shapes are measured and analyzed, and in addition to prior work, satellite-transition and stimulated-echo experiments are carried out. The final-state amplitudes extracted from the latter are reproduced using model calculations. It is shown how two-dimensional exchange spectra relating to N-site cone motions can be decomposed in terms of effective two-site-jump spectra. This latter approach is successfully tested for NaNO3.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III > Chair Inorganic Chemistry III - Univ.-Prof. Dr. Jürgen Senker
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 04 Aug 2020 10:27
Last Modified: 04 Aug 2020 10:27
URI: https://eref.uni-bayreuth.de/id/eprint/56304