Abstract

Tris(dimethylammonium nona chloro dibismuthate), [(CH 3] 2NH 2] 3Bi 2Cl 9, family has been investigated through proton magnetic resonance and relaxation measurements as a function of temperature. Results indicate the presence of two phase transitions at 152 and 78 K, accompanied by changes in the reorientational dynamics of the cation groups. Above 152 K, the [(CH 3) 2NH 2] + groups are undergoing isotropic reorientations with dynamic inequivalence, while in contrast they exhibit two-fold rotations in the low temperature phase. The phase transition at 78 K seems to be associated with considerable change in the orientational order of the molecular groups. Comparison is made with similar antimony (Sb) substituted compounds to discuss the microscopic effects of substitution of heavier bismuth (Bi) metal atom.

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