Mixed cobalt(III) complexes with aromatic amino acids and di­amines. III.

The title compound, [Co(C9H10NO3)2(C2H8N2)]Cl·4H2O, is one of six possible diastereomers of the (1,2-di­amino­ethane)­bis(S-tyrosinato)­cobalt(III) complex. The cobalt(III) ion has an octahedral coordination, with three five-membered chelate rings which have deformed coordination angles and coordinated O atoms in trans positions. In comparison with the previously reported crystal structure of the Δ-C1-cis(O) diastereomer [Miodragovic et al. (2001). Enantiomer, 6, 299–308], the compound presented in this paper has more planar five-membered amino­carboxyl­ate rings. Complex cations, chloride anions and water mol­ecules of crystallization are linked together by a network of hydrogen bonds. The chloride anions lie approximately between two Co atoms and form hydrogen bonds with all coordinated NH2 groups. In the crystal structure, there is a weak intermolecular π⋯π interaction between the phenyl rings.