Crystal structure, electrical study and dielectric behavior of a new centrosymmetric hybrid material

• A new compound “[C9H8NO]2CoCl4” was synthesized at room temperature and crystallizes in the monoclinic system with C2/c space group.
• The DSC shows one phase transition at 347 K.
• Electrical and dielectric technique was used.
• Equivalent circuit was discussed and a detailed analysis of the arcs reveals the presence of a grains and grains boundary.
• The AC conductivity dispersion is analyzed using Jonsher's power law.

The new organic–inorganic material [C9H8NO]2CoCl4 crystallizes at room temperature in the monoclinic system and C2/c space group. The atomic arrangement can be described as an alternation of organic–inorganic layers along the b-direction. The material cohesion of the compound is assured by hydrogen bonds CH⋯Cl and NH⋯Cl established between the anions and cations, NH⋯O hydrogen bonds and π − π stacking interactions established between almost parallels cations. Thermal analysis discloses a phase transition at the temperature 347 K, a detailed dielectric study was reported and shows a good agreement with thermal measurements. The electrical and the dielectric properties of the title compound have been investigated by means of impedance spectroscopy measurements over a wide range of frequencies and temperatures, 209 Hz–5 MHz and 298–423 K, respectively. The analysis of Nyquist plots has revealed the contribution of three electrically active regions corresponding to the bulk mechanism, distribution of grain boundaries and electrode processes, the dielectric relaxation is described by a non–Debye model. The study of the dielectric constants (ε'), (ε”) and loss tangent tan (δ) with frequency exhibits a distribution of relaxation times.

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