The crystal structure of (C 5 N 2 H 7 ) 4 .HBi 2 Cl 11 has been determined at room temperature by single crystal X-ray diffraction. The compound crystallizes in the triclinic system with Pī space group. The crystal structure consists of two asymmetric inequivalent molecules of 4-aminopyridinium and anionic HBi 2 Cl 11 chains. The HBi 2 Cl 11 anionic chains stacked along the a-axis are formed with Bi 2 Cl 11 dimers connected to each other via hydrogen atoms. The crystal packing is stabilized with N-H...Cl hydrogen bonds connecting aminopyridinium units to the HBi 2 Cl 11 anionic chains. The title compound exhibits an order-disorder phase transition at 338 K. The AC electrical conductivity properties of (C 5 N 2 H 7 ) 4 . HBi 2 Cl 11 compound have been investigated by means of impedance spectroscopy measurements over wide ranges of frequencies and temperatures, 200 Hz to 5 MHz and 303 to 418 K, respectively. Detailed analysis of the impedance spectrum suggests that the electrical properties of the material are strongly temperature dependent. The frequency-dependent conductivity data were fitted in the Jonscher's law: s w ð Þ ¼ sð0Þ þ Aw n . The nature of variation of DC conductivity suggests Arrhenius type of electrical conductivity.

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