Tungsten trisulfide

Tungsten trisulfide

Names
Other names Tungsten(VI) sulphide, tris(sulfanylidene)tungsten
Identifiers
CAS Number	12125-19-8
3D model (JSmol)	Interactive image
ChemSpider	9215149
EC Number	235-734-2
PubChem CID	11039977
InChI InChI=1S/3S.W Key: YMZATHYBBBKECM-UHFFFAOYSA-N
SMILES S=[W](=S)=S
Properties
Chemical formula	WS3
Molar mass	280.038 g/mol
Appearance	Brown solid
Related compounds
Related compounds	Tungsten disulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tungsten trisulfide is an inorganic compound of tungsten and sulfur with the chemical formula WS₃.^[1][2] The compound looks like chocolate-brown powder.^[3][4]

Synthesis

1. Bubbling hydrogen sulfide through hot acidified solution of tungstenates.^[5]
2. Reaction of tungsten disulfide and elemental sulfur on heating:^[6] $${\displaystyle {\ce {WS2 + S -> WS3}}}$$
3. Precipitates upon acidification of thiotungstate solutions:^[5] $${\displaystyle {\ce {(NH4)2WS4 + HCl -> WS3 + 2NH4Cl + H2S}}}$$ $${\displaystyle {\ce {Na2WS4 + H2SO4 -> WS3 + Na2SO4 + H2S}}}$$

Physical properties

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

Soluble in alkali metal carbonates and alkali metal hydroxides.^[3]

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) [1964]. 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.