In this research we report synthesis of new Barium- Chromium precursor complex with 2, 6- pyridine dicarboxylic acid (dipic) and o-phenylenediamine(opd) ligands. The complex [Ba(opd)3(H2O)2][Cr(dipic)2]2(1) has been characterized using FT-IR, UV–Vis, elemental analysis and Cyclic voltammetric (CV) method. Also in this study we report thermal decomposition of inorganic precursor complex (1). Characterization of the binary oxide nanoparticle was carried out using Fourier Transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) techniques. The X-ray diffraction pattern at room temperature revealed that, highly pure and crystallized BaCrO4in orthorhombic structure.