INTERNAL ROTATION AND PHASE TRANSITIONS IN LANTHANUM TETRAHYDROBORATES

Article abstract of DOI:10.1007/BF00750177

Usig the 1H, 11B, 139La NMR and relaxation MR methods, we have investigated the molecular dynamics in La(BH4)3 and its adduct with tetrahydrofuran La(BH3)3*3THF.We have observed phase transitions connected with the change in the nature of the internal rotation (reorientation) of the BH4^- anions.We have determined the barrier to reorientation of the BH4^- anions and the THF molecules in the investigated compounds, and we have shown that the change in the mobility of the THF molecule does not lead to a phase transition.