Nuclear magnetic relaxation studies of BH4 in metal Borohydrides
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Abstract
Abstract A different approach of nuclear magnetic resonance (NMR) relaxation of the rotational motion of BH 4 tetrahedron in light metal borohydrides was introduced. Previous NMR relaxation studies were mainly performed using an approximation which is based on a single exponential transition approach for the spin–lattice relaxation of the spin under quadrupolar interaction. In this new approach, a relaxation rate equation was derived by strictly taking into account both electric quadrupolar and magnetic dipolar contributions to the transitions between Zeeman energy states of quadrupolar 11 B nucleus that was coupled to many proton spins. Two exponential relaxation times derived from our theoretical treatment were applied to the analysis of 11 B spin–lattice relaxation of LiBH 4 and Ca(BH 4 ) 2 . The activation energies and the correlation times of the reorientational motions of BH 4 were evaluated from the two experimental spin–lattice relaxation times. The results were compared to previous activation energies and correlation times.
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