Structural characterization, thermal, ac conductivity and dielectric properties of (C7H12N2)(2)[SnCl6]Cl-2 center dot 1.5H(2)O

作者：Hajji Rachid^*; Oueslati Abderrazek; Hajlaoui Fadhel; Bulou Alain; Hlel Faouzi

来源：Phase Transitions, 2016, 89(5): 523-542.

DOI：10.1080/01411594.2015.1116529

• thermal analyses
• order-disorder
• dielectric properties
• phase transitions
• crystal structures
• ac conductivities

(C7H12N2)(2)[SnCl6]Cl-2 center dot 1.5H(2)O is crystallized at room temperature in the monoclinic system (space group P2(1)/n). The isolated molecules form organic and inorganic layers parallel to the (a, b) plane and alternate along the c-axis. The inorganic layer is built up by isolated SnCl6 octahedrons. Besides, the organic layer is formed by 2,4-diammonium toluene cations, between which the spaces are filled with free Cl- ions and water molecules. The crystal packing is governed by means of the ionic N-H center dot center dot center dot Cl and Ow-H center dot center dot center dot Cl hydrogen bonds, forming a three-dimensional network. The thermal study of this compound is reported, revealing two phase transitions around 360(+/- 3) and 412(+/- 3) K. The electrical and dielectric measurements were reported, confirming the transition temperatures detected in the differential scanning calorimetry (DSC). The frequency dependence of ac conductivity at different temperatures indicates that the correlated barrier hopping (CBH) model is the probable mechanism for the ac conduction behavior.

• 出版日期2016-5-3