Osmium tetrasulfide

Osmium tetrasulfide
Names
	Other names Osmium(VIII) sulphide, tetrakis(sulfanylidene)osmium
Identifiers
3D model (JSmol)	Interactive image;
PubChem CID	149252039;
	InChI InChI=1S/Os.4S Key: CQZYSTFQZYMZKW-UHFFFAOYSA-N;
	SMILES S=[Os](=S)(=S)=S;
Properties
Chemical formula	OsS4
Molar mass	318.47 g·mol−1
Appearance	dark brown crystals
Solubility in water	insoluble
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Osmium tetrasulfide is an inorganic compound, a salt of osmium metal and hydrogen sulfide acid with the chemical formula OsS₄.^[1]

Synthesis

Osmium tetrasulfide can be made by passing hydrogen sulfide through acidified solutions of osmium tetroxide:^[2]

OsO₄ + 4H₂S → OsS₄ + 4H₂O

Osmium tetrasulfide forms dark brown crystals, does not dissolve in cold water. It is soluble in dilute HNO₃.^[3] It forms hydrates.^[4]

Osmium tetrasulfide decomposes upon melting.^[5]

^ Bloxam, Charles Loudon (1888). Chemistry, Inorganic and Organic: With Experiments. P. Blakiston. p. 447. Retrieved 4 April 2023.
^ Satya, Prakash (2013). Advanced Chemistry of Rare Elements. S. Chand Publishing. p. 615. ISBN 978-81-219-4254-6. Retrieved 4 April 2023.
^ Gmelin, Leopold (1852). Hand Book of Chemistry. Cavendish Society. p. 411. Retrieved 4 April 2023.
^ Comey, Arthur Messinger (1896). A Dictionary of Chemical Solubilities: Inorganic. Macmillan and Company. p. 275. Retrieved 4 April 2023.
^ Sangeeta, D. (25 June 1997). Inorganic Materials Chemistry Desk Reference. CRC Press. p. 266. ISBN 978-0-8493-8900-9. Retrieved 4 April 2023.