Abstract
The title compound, (C16H36N)2[WS4(CuCl)4], has been obtained in a second polymorphic form. The anion, in which four of the six S⋯S edges of the central WS4 tetrahedron are bridged by CuCl neutral molecular units to give a planar pentanuclear WCu4 framework, is disordered on a crystallographic fourfold rotation axis, requiring equal occupancy of two sets of four positions for the S atoms. Copper has distorted trigonal planar coordination, involving two μ3-S atoms and a terminal Cl atom. The two independent cations lie on positions of symmetry \overline 4.
Highlights
We recently reported the structure of a second tetragonal polymorph of (NnBu4)2[MoS4(CuCl)4] in space group P4/n (Brooks et al, 2004); the ®rst polymorph, in space group I4, had very similar cell parameters (Se cheresse et al, 1991)
Se cheresse et al (1991) reported that the compound was isostructural with the molybdenum analogue in its bodycentred tetragonal form, though only the cell parameters and space group are given and the Cambridge Structural Database entry contains no atomic coordinates or other information indicating that the crystal structure has been fully determined
Atom W lies on a crystallographic fourfold rotation axis (4 or C4), while the two N atoms lie at improper fourfold rotation sites (4 or S4); the asymmetric unit of the structure consists of one-quarter of the anion and two separate quarters of cations
Summary
Moayad Hossaini Sadr,a Seyed Masoud Seyed Ahmadian,a Neil R. The title compound, (C16H36N)2[WS4(CuCl)4], has been obtained in a second polymorphic form. Se cheresse et al (1991) reported that the compound was isostructural with the molybdenum analogue in its bodycentred tetragonal form, though only the cell parameters and space group are given and the Cambridge Structural Database entry (refcode SORLIU; Version 5.25; Allen, 2002) contains no atomic coordinates or other information indicating that the crystal structure has been fully determined. Two other salts of the same anion have been reported: in the tetraphenylphosphonium salt (Clegg et al, 1987), the anion forms dimers through pairs of chloro bridges between Cu atoms, and in the tetra-n-propylammonium salt (Se cheresse et al, 1991), further m1952 Moayad Hossaini Sadr et al (C16H36N)2[WCu4Cl4S4] doi:10.1107/S1600536804030582 Acta Cryst.
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