Sodium thioantimoniate

Structure

left|thumb|Anhydrous NaSbS3 has a complicated structure featuring SbS4− tetrahedra interconnected by Na-S bonds. Color scheme: red = Sb, yellow = S, violet = Na. The nonahydrate consists of the tetrahedral tetrathioantimonate(V) anions and sodium cations , which are hydrated. The Sb-S distance is 2.33 Å. Related salts are known for different cations including ammonium and potassium.

The anhydrous salt is a polymer with tetrahedral Na and Sb sites.

Preparation

Sodium tetrathioantimonate nonahydrate is prepared by the reaction of "antimony trisulfide", elemental sulfur, and aqueous sulfide source. :

The Na2S can be generated in situ by the reaction of sodium hydroxide and S (co-generating sodium sulfate): : Charcoal can also be used to reduce the sulfur.

The required antimony trisulfide is prepared by treatment of Sb(III) compounds with sulfide sources: :

Reactions

The hydrate dissolves in water to give the tetrahedral ion. The salt gives antimony pentasulfide upon acidification: :

Notes

References

References

1. Krebs, B., "Thio- and Seleno Compounds of Main Group Elements - New Inorganic Oligomers and Polymers", Angewandte Chemie, 1983, volume 95, pages 113-34.
2. K. Mereiter, A. Preisinger and H. Guth "Hydrogen bonds in Schlippe's salt: refinement of the crystal structures of Na₃SbS₄^.9H₂O by X-ray diffraction and Na₃SbS₄^.9D₂O by neutron diffraction at room temperature" Acta Crystallographica 1979, vol. B35, 19-25. {{doi. 10.1107/S0567740879002442.
3. H. A. Graf, H. Schäfer "Zur Strukturchemie der Alkalisalze der Tetrathiosäuren der Elemente der 5. Hauptgruppe (pages 67–80) Zeitschrift für Anorganische und Allgemeine Chemie 1976, vol. 425, p67-p80. {{doi. 10.1002/zaac.19764250109
4. (1963). "Handbook of Preparative Inorganic Chemistry, 2nd Ed.". Academic Press.