Terdentate co-ordination by a cysteine derivative: crystal and molecular structure of bis(S-methyl-L-cysteinato)cobalt(III) perchlorate monohydrate

Abstract

The crystal and molecular structure of the title complex has been determined from three-dimensional X-ray diffractometer data by Patterson and Fourler methods. The compound crystallizes in the orthorhombic space group P2₁2₁2₁, with Z= 4 in a cell of dimensions a= 16.196(3), b= 8.393(2), and c= 11.944(2)Å. Full-matrix least-squares refinement using 1 436 independent reflections has reached R 0.043.

The structure contains one independent [(S-methyl-L-cysteinato)₂cobalt(III)]⁺ cation, a perchlorate anion, and a molecule of water of solvation. The metal, which is slightly distorted octahedral, makes two Co–S, two Co–O, and two Co–N bonds with the lignds [mean distances 2.271(2), 1.906(5), 1.946(6)Å]; bond angles at Co 83.8(3)–98.9(3)°. The two carboxy-oxygen and the amino nitrogen atoms are mutually cis while the two sulphur atoms are trans.