Abstract
A new organic-inorganic (C7H10NO)2[SnCl6]2H2O compound was synthesized and characterized by X-ray diffraction, thermal analysis, NMR spectroscopy and dielectric measurements. The crystal structure refinement shows that this compound crystallizes at 298 K in the monoclinic system (P21/a space group (Z = 2)). The structure was solved by Patterson method and refined to a final value of R = 0.034 for 2207 independent observed reflections. The cohesion and stability of the atomic arrangement result from the establishment of NH⋯Cl, O(W)H(W)⋯Cl and NH⋯O(W) hydrogen bonds between (C7H10NO)+ cations, isolated (SnCl6)2– anions and water molecules. This compound exhibits a phase transition at 305 K which was characterized by differential scanning calorimetry (DSC), X-rays powder diffraction and dielectric measurements. At high frequency, the electrical σTot.(ω,T) conductivity obey to the Jonscher's power law σTot.(ω,T) = σDC(T) + B(T) ωS(T). DC and AC conductivity in (C7H10NO)2[SnCl6]2H2O was investigated revealing that the phase transition from the monoclinic P21/a (phase I) to the monoclinic C2/c (phase II) which occurs at 305 K is characterized by a change of the mechanism of the electric transport: SPT in phase I and CBH in phase II.
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