Reorientational Motion in Alkali-Metal Borohydrides: NMR Data for RbBH4 and CsBH4 and Systematics of the Activation Energy Variations

Babanova, Olga A.;Soloninin, Alexei V.;Skripov, Alexander V.;Ravnsbaek, Dorthe B.;Filinchuk, Yaroslav;et.al.
(2011) The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces — Vol. 115, n° 20, p. 10305-10309 (2011)

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Authors
  • Babanova, Olga A.Ural Division of the Russian Academy of Sciences (Russia)
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  • Soloninin, Alexei V.Ural Division of the Russian Academy of Sciences (Russia)
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  • Skripov, Alexander V.Ural Division of the Russian Academy of Sciences (Russia)
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  • Ravnsbaek, Dorthe B.Aarhus University (Denmark)
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  • Filinchuk, YaroslavUCLouvain
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Abstract
To study the reorientational motion of the BH4 groups in RbBH4 and CsBH4, we have performed nuclear magnetic resonance (NMR) measurements of the H-1 and B-11 spin-lattice relaxation rates in these compounds over wide ranges of temperature (48-400 K) and resonance frequency (14-90 MHz). It is found that at low temperatures the reorientational motion in CsBH4 is the fastest among all of the borohydrides studied so far. The activation energies E-a for BH4 reorientations obtained from our data are 138 +/- 4 meV for RbBH4 and 105 +/- 7 meV for CsBH4. Investigating the systematics of E-a variations in alkali-metal borohydrides MBH4, we have found a correlation between E-a and the relative deviation of the actual M-B distance from the sum of the ionic radii of M and BH4.
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Babanova, O. A., Soloninin, A. V., Skripov, A. V., Ravnsbaek, D. B., Jensen, T. R., & Filinchuk, Y. (2011). Reorientational Motion in Alkali-Metal Borohydrides: NMR Data for RbBH4 and CsBH4 and Systematics of the Activation Energy Variations. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 115(20), 10305-10309. https://doi.org/10.1021/jp201735q (Original work published 2011)