Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

被引：0
作者：
Souad Chkoundali
Faouzi Hlel
Hamadi Khemekhem
机构：
[1] Université de Sfax,Laboratoire des Matériaux Multifonctionnels et Applications (LaMMA), Faculté des Sciences de Sfax
[2] Université de Sfax,Laboratoire de l’état Solide, Faculté des Sciences de Sfax
来源：
Applied Physics A | 2016年 / 122卷
关键词：
Differential Scanning Calorimetry; Title Compound; Inorganic Layer; ZnBr2; Reorientational Motion;
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摘要：
The new organic–inorganic compound tetrapropylammonium tetrabromozincate [N(C3H7)4]2ZnBr4 has been synthesized and characterized by single-crystal X-ray diffraction, differential scanning calorimetry, IR, Raman and impedance measurements. The crystal structure refinement shows that the [N(C3H7)4]2ZnBr4 compound is crystallized in the monoclinic system (space group C2/c) with the following unit cell parameters: a = 33.145(5) Å, b = 14.234(3) Å, c = 15.081(2) Å, β = 110.207(5)° and Z = 8. The structural arrangement of the title compound can be described as an alternation of organic and inorganic layers along the [100] direction. Differential scanning calorimetry disclosed two order–disorder transition phases located at 340 and 393 K. Besides, an analysis of the dielectric constants ε′ and ε″, at several frequencies, shows a distribution of relaxation times. This relaxation is probably due to the reorientational dynamics of alkyl chains.
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