Food additives are any substance not normally considered as a food by itself and not normally used as a typical ingredient of the food, not required nutritive value. Metal complexes of these colored food additive Red 2G is synthesized. The ligand is azo compound, elemental analysis of the prepared metal complexes, structural investigation of the complexes based on: Infrared, electronic spectra, and magnetic susceptibility, ESR study of copper complex was investigated. All complexes are of octahedral geometry. The thermal properties of the studied complexes were examined.