Abstract
The crystal and molecular structure of the title compound has been determined from single-crystal three-dimensional X-ray diffraction data collected by counter methods. Crystals are tetragonal, space group P41212, with unit-cell dimensions: a=b= 10·549(14), c= 36·510(14)A, Z= 8. The structure was solved by the heavy-atom method and refined by full-matrix least-squares to R 0·050 (for 3044 observed reflections). Each molybdenum atom is co-ordinated to two bridging sulphur atoms, one terminal oxygen atom, and a terdentate histidinato-ligand. Consideration of the Mo ⋯ Mo distance [2·848(1)A] suggests the co-ordination geometry around each metal atom can best be described as a seven-co-ordinate distorted capped octahedron sharing a common edge determined by the two sulphur atoms. Factors influencing the co-ordination geometry in this and related complexes are described.
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