Synthesis, structural and electrical properties of [C2H10N2][(SnCl(NCS)2]2

Synthesis, structural and electrical properties are given for a new organic stannous pseudo halide material. The structure of the [C2H10N2][(SnCl(NCS)2]2 reveals that the adjacent Sn(II) centres are bridged by a pair of SCN− anions to form à 1-D array giving rise to the anionic chains (SnCl(NCS)2)nn−. These chains are themselves interconnected by means of N–H…Cl(S) hydrogen bonds originating from the organic cation [(NH3)2(CH2)2]2+. The AC impedance measurements were performed as a function of both frequency and temperature. The electrical conduction and dielectric relaxation have been studied. The activation energy associated with the electrical relaxation determined from the electric modulus spectra was found close to that of the activation energy obtained for DC conductivity. The conduction mechanisms are attributed to the quantum mechanical tunneling model in phase I and to the proton hopping among hydrogen vacancies in phase II.

Atomic coordination in [C2H10N2][SnCl(NCS)2)2].Figure optionsDownload as PowerPoint slideHighlights
► X-ray diffraction analysis shows the 1D network character of the structure.
► DSC experiments show a phase transition at 336 K.
► The AC conductivity is interpreted in terms of Jonsher's law.
► Two conduction mechanisms are proposed for phase I and II.