Crystal and molecular structure of bis(cyclopentadienyl)tungsten tetrasulphide

The crystal and molecular structure of bis(cyclopentadienyl)tungsten tetrasulphide, (C₅H₅)₂WS₄, has been determined from three-dimensional X-ray data collected by counter techniques. The coordination about the tungsten atom, consisting of the two terminal sulfur atoms of the tetrasulphide chain and the ring centroids of the two cyclopentadienyl rings, may be described as a distorted tetrahedron. The inner S-S bond distance is found to be somewhat shorter than the outer two S-S bond distances in the tetrasulphide chain. The substance crystallizes in the monoclinic space groupP2₁/n witha = 11·242(3),b = 12·154(5),c = 8·790(2) Å and = 92·93(3) °. The structure was refined by least-squares techniques using 1581 independent reflections for whichFsk0/2 > 2(Fsk0/2), and the refinement converged at a conventionalR factor (onF) of 4·5 %.We wish to thank Dr. H. Köpf (Würzburg) for the gift of the crystals and the U.S. Atomic Energy Commission for financial support.