Transition metal complexes with redox active ligands as dioxelenes are very known by its bistability property called valence tautomerism, used in electronic devices. In this work a coordination compound of cobalt(II) and 2-(1H-imidazol-2-yl)-phenol was prepared intending to investigate this specific electronic phenomenon. The complex was characterized by IR, elemental analysis, mass and UV-VIS spectroscopy and the ligand by this previous techniques and 1H and 13C NMR.