Synthesis, infra-red, MAS-NMR characterization, structural study and electrical properties of the new compound [C5H6ClN2]2Cd3Cl8

A new organic inorganic compound, octachlorocadmate of bis (4-amino-2-chlorinopyridinium) [CAP]2Cd3Cl8, has been synthesized and is characterized by a single-crystal X-ray diffraction. It crystallizes in monoclinic space group P21/C (N°: 14) with the parameters a = 3.8039 (2) Å, b = 23.26510 (10) Å, c = 12.8800 (2) Å, β = 95.7100 (10)°, V = 1134.20 (6) Å3, Z = 2. This compound shows the presence of the organic cations as spacers between the inorganic layers that can be visualized as triple chains of edge-shared CdCl6 extending in the ac plane and are combined by static attracting forces in the crystal and π–π interactions which reinforce the association between cations. The studies by FT-IR and TGA show the presence of the surface water molecule. The MAS-NMR spectra showed two and five isotropic resonances, 111Cd and 13C, respectively. The dielectric conductivity of this compound has been measured in the temperature range 303–418 K and the frequency range 209 Hz–5 MHz. The Cole–Cole (Z′ versus Z″) plots are well fitted to an equivalent circuit model. The analysis of the experimental data based on the jump relaxation model, showed that translation motion of the charge carrier and reorientation hopping between equivalent sites of the metal chloride anion and the cation groups are responsible for the observed conductivity in the temperature regions (I) (303–348 K) and (II) (373–413 K).