In the title complex, tetrethylammonium [1‐methyl­imidazole‐2(3H)‐thione‐2κS]­dioxo‐1κ2O‐di‐μ‐sulfido‐1:2κ4S:S‐cop­per(I)­tungstate(VI), (C8H20N)[WCuO2S2(Hmimt)], where Hmimt is 1‐methyl­imidazole‐2(3H)‐thione (C4H6N2S), the W and Cu atoms have tetrahedral and trigonal planar coordination, respectively. Two sulfide ligands bridge the two metal centres; tungsten is additionally coordinated by two terminal oxo ligands and copper by the exocyclic S atom of Hmimt. The bridged W⋯Cu distance is 2.670 (3) Å. Anions are linked into chains by N—H⋯O hydrogen bonds between Hmimt and oxo ligands.

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The title compound, (NEt4)3[(MoOS3)(CuBr)2(CuBr2)]·(CH3)2CO, contains a central pseudo‐tetrahedral MoOS32− unit with Cu atoms bridging all three S⋯S edges while the Mozdbnd;O bond remains terminal. The Mo, 3 Cu and three triply bridging S atoms occupy seven of the vertices of a distorted cube, the vertex opposite Mo being vacant. Two of the Cu atoms carry one terminal halogen atom each and have distorted trigonal planar coordination, while the third carries two and has distorted tetrahedral coordination. One of these two halogen atoms on the third Cu atom has a secondary interaction with one of the other Cu atoms, so it may be considered as semi‐bridging. Three of the four halogen sites show disorder as a result of minor substitution of Cl for Br, the semi‐bridging halogen atom being purely or essentially Br. This semi‐bridging type of halogen is unprecedented in MOS3Cu3Xn cluster anions.