A new, more efficient procedure for the preparation of potassium tris(malonato)cobaltate(III) dihydrate

A new, very efficient and elegant procedure for the preparation of potassiu m tris(malonato)cobaltate(III) dihydrate, starting from Co(OH)(3) and potas sium hydrogenmalonate, is presented. The most important advantages of this procedure, in comparison to the previously reported ones, are: a relatively short time required, saving of the reagents and solvents, and a very good yield of pure product. The identification of the obtained complex was carri ed out by elemental analyses, electronic absorption and IR spectroscopy. Th e spectral data are in accordance with the previously reported literature d ata. Analogous procedure was also preliminary tested for the preparation of the corresponding tris(oxalato)- and tris(succinato)cobaltate(III). Finall y, the described complex can be used as a starting material for the prepara tion of one mixed ligand Co(III) complex.