Structural characterization, thermal, ac conductivity and dielectric properties of (C₇H₁₂N₂)₂[SnCl₆]Cl₂·1.5H₂O

Abstract

(C₇H₁₂N₂)₂[SnCl₆]Cl₂·1.5H₂O is crystallized at room temperature in the monoclinic system (space group P2₁/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···Cl and Ow—H···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.

Keywords:

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

Acknowledgements

The authors are thankful to Galven Cyrille, IMMM-UMR CNRS 6283 (France), for helping with TG analyses coupled with mass spectrometry and to Prof. Ben Salah Abdelhamid, MESLAB-Sfax Faculty of Science Tunisia, for providing us with the X-ray diffraction data of the compound.

Disclosure statement

No potential conflict of interest was reported by the authors.