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Three octahedral chromium(III) complexes of the general formula Na[Cr(S,S-eddp)L].2H2O, where eddp = the tetradentate O-N-N-O-type ligand ethylenediamine-N,N?-di-S,S-2-propionate and L = a bidentate O-O-type ligand, either oxalate or malonate, were prepared. The complexes were synthesized by the reaction of chromium(III) chloride, S,S-eddp and malonic acid or sodium oxalate, at 60?C. The complexes were isolated chromatographically and the geometric configuration of the complexes was proposed on the basis of their infrared and electronic absorption spectra.

In the reaction of ruthenium(III) chloride and an edda-like ligand ethylenediamine-N,N'-di-S,S-2-propionic acid (S,S-eddp) in aqueous solution led to the formation of only one of the three possible geometrical isomers potassium-s-cis-dichlorido-(ethylenediamine-N,N'-di-S,S-2-propionato)-ruthenate(III)--trihydrate, s-cis-K[Ru(S,S-eddp)Cl 2 ]·3H 2 O. The assumed geometry of the complex was based on its electronic absorption and infrared spectra.