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The temperature dependences of the second moment and spin-lattice relaxation time of  1 H and  19 F NMR were measured on ammonium trifluorostannate (II) NH 4 SnF 3 . It was found that the NH 4  +  ions having a C 3  symmetry in the crystal undergo overall reorientations with an activation energy of 22 kJ mol  - 1 .

1 H and 19 F NMR Study of Ammonium Ion Motion in Ammonium Trifluorostannate (II)