Crystal and molecular structure of di-µ-sulphido-bis[oxo-(L-cysteinato methyl ester-N,S)molybdenum(V)]

Abstract

Crystals of Di-µ-sulphido-bis[oxo-(L-cysteinato methyl ester-N,S)-molybdenum(V)], Mo₂S₂O₂(SO₂NC₄H₈)₂, are monoclinic, space group P2₁, with a= 9·348(9), b= 5·640(7), c= 19·440(16)Å, β= 116·66(10)°, and Z= 2. The intensities of 961 independent reflections above background were collected by counter methods and the structure refined to R 0·086. Each molybdenum atom in the dimer has a similar environment, which can be described as distorted trigonal bipyramidal; each molybdenum atom is bonded to a sulphur atom [the distances are equivalent at 2·38(1)Å] and to a nitrogen atom [2·23(3)Å] of an L-cysteine ester, to a terminal oxygen atom (the Mo–O distances are significantly different at 1·65(3) and 1·78(3)Å] and to two sulphur atoms [2·31(1)Å] which bridge to the adjacent molybdenum atom. The Mo–Mo distance is 2·804(4)Å. The conformations of the L-cysteine methyl esters are equivalent.