Acta Cryst. (2004). E60, m204-m206  [ doi:10.1107/S1600536804001175 ]

A second tetragonal polymorph of bis(tetra-n-butylammonium) tetrakis[chloro(₃-sulfido)copper(I)]molybdate(VI)

N. R. Brooks, W. Clegg, M. H. Sadr, M. Esm-Hosseini and R. Yavari

Abstract: The title compound, bis(tetra-n-butylammonium) tetrachlorotetra-₃-sulfidotetracopper(I)molybdenum(VI), (C₁₆H₃₆N)₂[MoS₄(CuCl)₄], has been obtained in a second polymorphic form. The anion, in which four of the six SS edges of the central MoS₄ tetrahedron are bridged by CuCl neutral molecular units to give a planar pentanuclear MoCu₄ framework, is disordered on a crystallographic fourfold rotation axis, requiring equal occupancy of two sets of four positions for the S atoms. There is additional disorder as a result of 8.2  (2)% substitution of Cl by Br, arising from tetra-n-butylammonium bromide used in the synthesis. Copper has distorted trigonal planar coordination, involving two ₃-S atoms and a terminal halogen atom. The two independent cations lie on positions of symmetry .

Online 23 January 2004

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