Version 1
: Received: 9 August 2024 / Approved: 9 August 2024 / Online: 9 August 2024 (13:00:35 CEST)
How to cite:
Babanova, O. A.; Sadikin, Y.; Skoryunov, R. V.; Soloninin, A. V.; Skripov, A. V. Anion and Cation Dynamics in Mixed-Anion Hydroborate Na3(BH4)(B12H12): 1H, 11B, and 23Na NMR Studies. Preprints2024, 2024080715. https://doi.org/10.20944/preprints202408.0715.v1
Babanova, O. A.; Sadikin, Y.; Skoryunov, R. V.; Soloninin, A. V.; Skripov, A. V. Anion and Cation Dynamics in Mixed-Anion Hydroborate Na3(BH4)(B12H12): 1H, 11B, and 23Na NMR Studies. Preprints 2024, 2024080715. https://doi.org/10.20944/preprints202408.0715.v1
Babanova, O. A.; Sadikin, Y.; Skoryunov, R. V.; Soloninin, A. V.; Skripov, A. V. Anion and Cation Dynamics in Mixed-Anion Hydroborate Na3(BH4)(B12H12): 1H, 11B, and 23Na NMR Studies. Preprints2024, 2024080715. https://doi.org/10.20944/preprints202408.0715.v1
APA Style
Babanova, O. A., Sadikin, Y., Skoryunov, R. V., Soloninin, A. V., & Skripov, A. V. (2024). Anion and Cation Dynamics in Mixed-Anion Hydroborate Na3(BH4)(B12H12): 1H, 11B, and 23Na NMR Studies. Preprints. https://doi.org/10.20944/preprints202408.0715.v1
Chicago/Turabian Style
Babanova, O. A., Alexei V. Soloninin and Alexander V. Skripov. 2024 "Anion and Cation Dynamics in Mixed-Anion Hydroborate Na3(BH4)(B12H12): 1H, 11B, and 23Na NMR Studies" Preprints. https://doi.org/10.20944/preprints202408.0715.v1
Abstract
Sodium borohydride-closo-hydroborate Na3(BH4)(B12H12) exhibits the high room-temperature ionic conductivity and high electrochemical stability. To study the dynamical properties of this mixed-anion compound at the microscopic level, we have measured the 1H, 11B, and 23Na nuclear magnetic resonance spectra and nuclear spin-lattice relaxation rates over the temperature range of 8 – 573 K. Our 1H and 11B spin-lattice relaxation measurements have revealed two types of reorientational jump motion. The faster motional process attributed to reorientations of the [BH4]− anions is characterized by the activation energy of 159 meV, and the corresponding reorientational jump rate reaches ~10^8 s^-1 near 130 K. The slower process ascribed to reorientations of the larger [B12H12]− anions is characterized by the activation energy of 319 meV, and the corresponding reorientational jump rate reaches ~10^8 s^-1 near 240 K. The results of the 23Na nuclear magnetic resonance measurements are consistent with the fast long-range diffusion of Na+ ions in Na3(BH4)(B12H12). The diffusive jump rate of Na+ is found to reach ~10^4 s^-1 at 300 K and ~8 × 10^8 s^-1 at 530 K. Comparison of these jump rates with the ionic conductivity data suggests the importance of correlations between diffusing ions.
Keywords
hydroborates; reorientations; diffusion; nuclear magnetic resonance
Subject
Chemistry and Materials Science, Physical Chemistry
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
