Acta Cryst. (2008). E64, m1546  [ doi:10.1107/S1600536808036532 ]

Tris(tetramethylammonium) tetra-₂-sulfido-tetrasulfidocopper(I)dimolybdenum(VI) N,N-dimethylformamide solvate

Y. Cao, Y. Chen and G. Cheng

Abstract: The title compound, (C₄H₁₂N)₃[CuMo₂S₈]·C₃H₇NO, was obtained from the self-assembly of tetrathiomolybdate, tetramethylammonium nitrate and cuprous sulfide in dimethylformamide (DMF). The asymmetric unit contains three (NMe₄)⁺ cations, one [Mo₂S₈Cu]^3- anion and one DMF solvent molecule, and no obvious interactions are observed between these species. The trinuclear anion can be viewed as fused [MoS₄Cu]^- units sharing a copper center. The geometric parameters of the trivalent anion are comparable to those reported for other related salts including isomorphous anions, namely (NEt₄)₂(PPh₄)[Mo₂S₈Cu] (a) and (Ph₃P=N=PPh₃)₂(NEt₄)[W₂S₈Cu]·2CH₃CN (b). However, the Mo-Cu-Mo angle is found to be 160.24 (3)° for the title salt, while this angle is 162.97 (2)° in (a) and the W-Cu-W angle is 170.3 (2)° in (b), indicating that the largest deviation from linearity is in the title compound.

Online 13 November 2008

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