Bis(tetra-n-butylammonium) tetrakis[chloro(μ3-sulfido)copper(I)]tungstate(VI):: a second polymorph

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 mu(3)-S atoms and a terminal Cl atom. The two independent cations lie on positions of symmetry (4) over bar.