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Background. The use of new drugs with high bioactivity in agriculture is relevant. One of them is the combination of o-phenylenediamine with a ligand that has potential biological activity. Purpose: Preparation of a mixed-ligand complex compound of o-phenylenediamine and 2,4- dihydroxybenzoic acid with Ni(II), study of synthesis conditions, determination of the crystal structure and physicochemical properties. Methodology. X-ray diffraction analysis (XRD) and IR spectroscopy (Xcalibur R Oxford Diffraction and IRAffinity-1S IR spectrometer) were used. Originality. For the first time, a mixed-ligand complex of o-phenylenediamine with Ni(II) was synthesized and the crystal structure was studied, Hirschfeld surface analysis and physicochemical properties of the synthesized complex were performed. Findings. A compound consisting of o-phenylenediamine, 2,4-dihydroxybenzoic acid and [(Ni(C6H8N2)2(C7H6O4)2)] was synthesized and its properties were studied. [ABSTRACT FROM AUTHOR]