Crystal Research and Technology
Cryst. Res. Technol. 43, 314 (2008) - Abstract -

Crystal structure and phase transition in the compound [C6H5CH2NH(CH3)2]TlCl4

M. Abdi, A. Hadrich*, and F. Zouari

Laboratoire des Sciences des Matériaux et d’Environnement, département de chimie, Faculté des Sciences de Sfax, BP 802, 3018 Sfax, Tunisie
*Laboratoire de l’Etat Solide, Faculté des Sciences de Sfax, BP 802, 3018 Sfax, Tunisie

Keywords phase transition, structure, raman, dielectric
PACS 61.66.Hq
DOI 10.1002/crat.200711059

The N-N dimethyl benzylammonium tetrachlorothallate (III) [C6H5CH2NH(CH3)2]TlCl4 crystallizes in the monoclinic system P21/n at room temperature with the following unit cell dimensions: a = 7.725(3) Å, b = 14.080(5) Å, c = 13.697(4) Å, β = 91.2(2)° with Z = 4. The structure shows a layer arrangement perpendicular to the b axis: planes of [TlCl4]- tetrahedra alternate with planes of [C6H5CH2NH(CH3)2]+ cations. The cohesion of the atomic arrangement is ensured by hydrogen bonds N-H...Cl. Differential scanning calorimetric and optical birefringence measurements reveals a phase transition at T = 339K. Raman spectroscopic study and dielectric measurements were performed to discuss the mechanism of the phase transition.




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