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The temperature dependence of the  35 Cl NQR spin-latticew relaxation time T 1Q  has been determined for the three resonance lines observed in [ ( C 2 H 5  )  3 NH] 2 SnCl 6  . The higher frequency lines fade out around 150 K upon heating, whereas the lowest line shows up to room temperature no anomaly, although these three lines are assigned to chlorines belonging to the same complex anion. The T 1Q  values of the higher two lines decrease exponentially around the fade-out temperature, where T 1q  of the lowest line shows no such behavior. These results are explained by the onset of uniaxial reorientations of the octahedral complex ions by 90° about the Cl -Sn -Cl axis containing the lowest frequency chlorines. The activation energy ( E a )of this reorientation (22-24 kJ mol -1  ) is the lowest so far reportd for [SnCl 6  ]  2 -  ions. E a  about the other axes is 67 kJ mol -1  , indicating a remarkable anisotropic reorientation.

Uniaxial Reorientation of Octahedral Complex Anions Excited in Triethylammonium Hexachlorostannate (IV) Crystals