Abstract: | A recently prepared new thiotungstate has been characterized by three-dimensional X-ray structure analysis, to be a double salt, containing K2WOS3 and KCl in equimolar proportions: potassium trithiotungstate chloride, K3(WOS3)Cl. Space group: Pca21 with a = 12.507, b = 6.317, c = 12,371 Å, Z = 4. The compound represents a new structure type with stoichiometry MI2XY4 · MIZ. Besides isolated tetrahedral WOS32- ions (bond lengths W–O 1.760 Å, W–S 2.208, 2.197, 2.196 Å) the structure contains Cl? ions octahedrally co-ordinated by K+, the K+ ions having 5S + 10 + 2Cl as neighbours. The dimensions of the WOS32? ions in this compound show that, as in other transition metal oxo-, thio- and selenoanions, strong π bonding is present, the W–S bonds taking part in the π bond system. |