A cobalt complex with the tetramethylammonium cation was synthesized and identified. This complex was prepared by reaction of tetramethylammonium chloride with CoF2 in acetonitrile. Characterization of this complex was made by microanalyses, FT-IR, IR and UV–Visible spectroscopies. The IR spectra reveal the coordination from halides to central cobalt atom and intermolecular hydrogen bonding.