trans(S)‐(S‐Methyl‐d‐penicillaminato)(d‐penicillaminesulfinato)cobalt(III) Monohydrate

The title complex, {[3-methylthio-d-valinato(1-)][3-sulfino-d-valinato(2-)]cobalt(III) monohydrate, [Co(C5H9NO4S)(C6H12NO2S)].H2O}, containing thioether and sulfinato moieties, has two different types of donor S atoms situated in trans positions to each other. The Co atom is octahedrally surrounded by the N, O and S atoms of each tridentate ligand. The complex molecule has been resolved spontaneously by crystallization. The absolute configuration of the coordinated S atom in the thioether ligand is R(S). The lengthening of the Co—S distances [2.376 (3) and 2.366 (3) A] for the thioether ligand depends on the strong trans influence from the sulfinato group.