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

Abstract

Crystals of Di-µ-oxo-bis[oxo-(L-cysteinato ethyl ester-N,S)-molybdenum(V)], Mo₂O₄(SO₂NC₅H₁₀)₂, are monoclinic, space group P2₁, with a= 10·105(10), b= 6·260(7), c= 15·426(13)Å, β= 107·55(11)°, and Z= 2. The intensities of 1053 reflections collected by counter methods were used and the structure refined to R 0·058. The molybdenum atoms in the dimer have identical environments, which can be described as distorted trigonal bipyramidal, each molybdenum being bonded to a sulphur [mean 2·385(15)Å] and to a nitrogen [2·22(2)Å] of a L-cysteine ethyl ester and to three oxygen atoms, one of which is terminal [1·66(2)Å] and the others bridge [1·93(2)Å] to the adjacent molybdenum atom. In addition, there is a Mo–Mo bond of [2·562(3)Å]. The conformations of the two L-cysteine esters show marked differences from each other, particularly in the relative orientations of the –CO₂Et groups.