Optical, UV-Vis spectroscopy studies, electrical and dielectric properties of transition metal-based of the novel organic–inorganic hybrid (C₆H10N₂)(Hg₂Cl₅)₂.3H₂O

In this work, we are interested in the synthesis of new hybrid material (C6[Formula: see text]N2)(Hg2[Formula: see text].3H2O grown by hydrothermal methods. X-ray diffraction indicates that this compound crystallizes at 150(2) K in the monoclinic system with [Formula: see text]/[Formula: see text] space group, with the following unit cell parameters: [Formula: see text](15) Å, [Formula: see text](15) Å, [Formula: see text](6) Å, [Formula: see text] and [Formula: see text]. On the other hand, the optical properties of this compound were studied using ultraviolet-visible (UV-Vis) spectroscopy in the range 200–800[Formula: see text]nm. Furthermore, the optical absorbances are used to determine the absorption coefficient [Formula: see text] and the optical band gap [Formula: see text], so the Tauc model was used to determine the optical gap energy of the compound (C6[Formula: see text]N2)(Hg2[Formula: see text].3H2O. The analysis of the results revealed the existence of optical allowed indirect transition mechanisms with the band gap energy equal to (2.37[Formula: see text]eV) for liquid and (4.33[Formula: see text]eV) for solid. Impedance measurements indicate that the electrical and dielectric properties are strongly dependent on both temperature and frequency. Nyquist plots ([Formula: see text] versus [Formula: see text]) show that the conductivity behavior is accurately represented by an equivalent circuit model which consists of a series combination of bulk and grain boundary. Furthermore, the angular frequency dependence plots of the real and imaginary parts, [Formula: see text] and [Formula: see text], of complex dielectric permittivity [Formula: see text] and tan [Formula: see text] losses at several temperatures between 303 and 453[Formula: see text]K were studied for the title compound. Finally, the modulus plots can be characterized by the presence of two relaxation peaks.