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Tungsten trisulfide is an inorganic compound of tungsten and sulfur with the chemical formula WS₃. The compound looks like chocolate-brown powder.

Synthesis

1. Bubbling hydrogen sulfide through hot acidified solution of tungstenates.
2. Reaction of tungsten disulfide and elemental sulfur on heating: $${\displaystyle {\ce {WS2 + S -> WS3}}}$$
3. Precipitates upon acidification of thiotungstate solutions: $${\displaystyle {\ce {(NH4)2WS4 + HCl -> WS3 + 2NH4Cl + H2S}}}$$ $${\displaystyle {\ce {Na2WS4 + H2SO4 -> WS3 + Na2SO4 + H2S}}}$$

Physical properties

Slightly soluble in cold water and forms colloidal solution in hot water.

Soluble in alkali metal carbonates and alkali metal hydroxides.

Chemical properties

Tungsten trisulfide can be decomposed by heating into tungsten disulfide and elemental sulfur: $${\displaystyle {\ce {WS3 -> WS2 + S}}}$$

Reacts with sulfide solutions: $${\displaystyle {\ce {WS3 + (NH4)2S -> (NH4)2WS4}}}$$

Reduced by hydrogen: $${\displaystyle {\ce {WS3 + 3H2 -> W + 3H2S}}}$$

References

1. Scott, Robert A.; Jacobson, Allan J.; Chianelli, Russ R.; Pan, W. H.; Stiefel, Edward I.; Hodgson, Keith O.; Cramer, Stephen P. (1 April 1986). "Reactions of molybdenum trisulfide, tungsten trisulfide, tungsten triselenide, and niobium triselenide with lithium. Metal cluster rearrangement revealed by EXAFS". Inorganic Chemistry. 25 (9): 1461–1466. doi:10.1021/ic00229a032. ISSN 0020-1669. Retrieved 1 November 2021.
2. Hille, Russ; Schulzke, Carola; Kirk, Martin L. (29 September 2016). Molybdenum and Tungsten Enzymes: Bioinorganic Chemistry. Royal Society of Chemistry. p. 155. ISBN 978-1-78262-877-4. Retrieved 1 November 2021.
3. ^ Kirk-Othmer Concise Encyclopedia of Chemical Technology, 2 Volume Set. John Wiley & Sons. 16 July 2007. p. 1122. ISBN 978-0-470-04748-4. Retrieved 1 November 2021.
4. "Tungsten trisulfide". National Institute of Standards and Technology. Retrieved 1 November 2021.
5. ^ Zelikman, A. N.; Krein, O. E.; Samsonov, G. V. (1966) . Belyaevskaya, L. V. (ed.). Metallurgiya redkikh metallov [Metallurgy of Rare Metals]. Israel Program for Scientific Translations. Translated by Aladjem, A. (2nd ed.). Jerusalem: S. Monson / Wiener Bindery. p. 7. Retrieved 1 November 2021 – via Google Books.
6. "Tungsten Trisulfide-- Tungsten Trisulfide Professional Manufacturer and Supplier". tungsten-powder.com. Retrieved 1 November 2021.

• Tungsten compounds
• Sulfides