Crystal structure, vibrational and magnetic properties of the monohydrated cobalt (II) complex with 1-(4-Nitrophenyl)-1H-imidazolium cation, (C9H8N3O2)2CoCl4·H2O

• (C9H8N3O2)2CoCl4·H2O crystals have been grown by the slow evaporation technique.
• Thermal studies of the title compound were analyzed by TGA/DSC.
• The crystal packing is governed by the NH⋯Cl, OH⋯Cl, OH⋯O hydrogen bonds and π⋯π interactions.
• Weak antiferromagnetic coupling between the cobalt (II) centers at very low temperatures.

Single crystals of organic-inorganic hybrid compound Bis(1-(4-Nitrophenyl)-1H-imidazolium) tetrachlorocobaltate monohydrate, was obtained by slow evaporation of an aqueous solution at room temperature and characterized by a single-crystal X-ray diffraction, an elemental and thermal analysis, UV–Vis spectra, FT-IR and FT-Raman spectroscopies as well as magnetic measurements. The entitled compound crystallizes into triclinic system of P-1 space group. The Co(II) ion of the [CoCl4]2- anion shows a tetrahedral coordinating geometry. The atomic arrangement can be described as an alternation of organic and inorganic layers along the c-axis. The different components are connected by NH⋯Cl, OH⋯Cl and OH⋯O hydrogen bonds. The differential scanning calorimetry (DSC) of the title compound revealed an endothermic peak at 52 °C related with a phase transformation caused by a slight deformation of the inorganic group. The room temperature IR and Raman spectra were recorded and analyzed on the basis of literary data to gain more information about the entitled compound. The magnetic susceptibility measurements in the temperature range 2–100 K shows that the complex displays a weak antiferromagnetic exchange interaction at very low temperatures.

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