The spin-lattice relaxation phenomenon is a good tool for obtaining the ther-modynamical parameters of solid metal borohydrides. In the process of deriving the motional parameters from the NMR experimental data, it is very important to adequately interpret the spin-lattice relaxation data. By more precisely considering the quadrupolar interaction of 11B and intermolecular 1H-1H dipole-dipole interactions, the activation energies and correlation times of the rotational motions of BH4 group in solid magnesium borohydride could be more accurately determined, and the spin-lattice relaxation phenomenon of the quadrupolar nucleus could be more appropriately understood.
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