Abstract
1H spin lattice relaxation study in the temperature range 439–77K has been carried out in dimethyl ammonium (DMA) hexabromo selenate. A high temperature phase transition is observed as a dip in T1 around 360K, followed by a slope change at 222K, and a discontinuous jump in T1 at 154K, which are also attributed to phase transitions. DMA diad axis motion and spin–rotation interaction are found to be the dominant mechanisms responsible for the observed T1 behaviour above 222K, while between 222 and 154K, DMA torsional oscillations contribute significantly. Below 154K the relaxation is governed by the methyl group dynamics. The motional effects are also reflected in the second moment variation with temperature.
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