Abstract
The title compound crystallizes in the space group P2 1/ c with the following unit cell dimensions: a=7.885(2) Å, b=25.937(2) Å, c=11.059(5) Å, β=91.067(2)°, Z=4. The examination of the structure shows a layer arrangement perpendicular to the b axis: planes of β phenylethylammonium cations [C 6H 5(CH 2) 2NH 3] 2+ alternate with planes of [Cd 0.75Hg 0.25Br 4] 2− tetrahedra. The cohesion of the atomic arrangement is ensured by hydrogen bonding (NH…Br) and Van der Waals contacts. DSC and Raman spectroscopy measurements were carried out and reveals a transition at T=347 K. This transition display an order–disorder mechanism involving mainly conformational changes of the organic chain [C 6H 5(CH 2) 2NH 3] 2+ coupled with distortion of the (Cd/Hg)Br 4 tetrahedra. The transitional behavior and the crystal dynamics will be discussed and compared with those found in the literature for homologous compounds.
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