Abstract
Reaction of (NH4)2[MS4] (M = Mo, W) with aqueous dimethylamine (CH3)2NH or KOH results in the formation of bis(dimethylammonium) tetrasulfidometalates [(CH3)2NH2]2[MS4] (M = W 1; Mo 2) or dipotassium tetrasulfidotungstate K2[WS4] (3). Compounds 1–3 were characterized by elemental analysis, IR and UV-Vis spectra and their crystal structures were determined. Compounds 1 and 2 are isostructural and crystallize in the centrosymmetric monoclinic space group P21/n. The structures consist of two crystallographically independent dimethylammonium cations and a slightly distorted tetrahedral [MS4]2− anion with all atoms situated in general positions. The cations and anions are involved in several weak N–H ··· S and C–H ··· S interactions. Compound 3 crystallizes in the centrosymmetric orthorhombic space group Pnma and is isostructural with the previously reported K2[MoS4]. The structure of 3 consists of discrete slightly distorted tetrahedral [WS4]2− anions of m symmetry, separated by two crystallographically independent K+ cations located on mirror planes. A comparative description of the alkali metal, ammonium, methyl and dimethylammonium tetrasulfidometalates is presented.
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