Ammonium tetrathiotungstate

Ammonium tetrathiotungstate

Names
IUPAC name azane;bis(sulfanylidene)tungsten;sulfanide
Identifiers
CAS Number	13862-78-7  N
3D model (JSmol)	Interactive image
ChemSpider	13547274
ECHA InfoCard	100.156.973
EC Number	628-727-4
PubChem CID	53393497
InChI InChI=1S/2H3N.2H2S.2S.W/h2*1H3;2*1H2;;;/p-2 Key: CCFCMIWYHMKPAO-UHFFFAOYSA-L
SMILES N.N.[SH-].[SH-].S=[W]=S
Properties
Chemical formula	H8N2S4W
Molar mass	348.16 g·mol−1
Appearance	yellow to orange crystals
Density	2.71 g/cm3 (hydrate)
Solubility in water	soluble
Hazards
GHS labelling: [1]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P264, P280, P302+P352, P321, P332+P313, P362 [2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ammonium tetrathiotungstate is a chemical compound with the chemical formula (NH₄)₂WS₄. ^{[3] [4]}

Synthesis

Ammonium tetrathiotungstate can be obtained by the reaction of tungstic acid, ammonia, and hydrogen sulfide in a water bath at 65-70°C: ^[5]

H₂WO₄ + 2NH₃·H₂O + 4H₂S → (NH₄)₂WS₄ + 6H₂O

Physical properties

Ammonium tetrathiotungstate forms yellow to orange crystals, soluble in water. ^{[6] [7]}

The compound decomposes under heat to produce tungsten trisulfide at 170-280°C and tungsten disulfide at 260-500°C. ^[8]

Uses

The compound is used in materials science and catalysis. ^[7]

References

1. "Ammonium tetrathiotungstate" (PDF). Carl Roth. Retrieved 27 February 2025.
2. "Ammonium Tetrathiotungstate | Ammonium thiotungstate (VI) | H8N2S4W". Ereztech. Retrieved 27 February 2025.
3. Delmon, B.; Grange, P.; Froment, G. F. (3 November 1999). Hydrotreatment and Hydrocracking of Oil Fractions. Elsevier. p. 113. ISBN   978-0-08-053426-8 . Retrieved 27 February 2025.
4. Wang, Haidou; Xu, Binshi; Liu, Jiajun (1 February 2013). Micro and Nano Sulfide Solid Lubrication. Springer Science & Business Media. p. 38. ISBN   978-3-642-23102-5 . Retrieved 27 February 2025.
5. Perry, Dale L. (19 April 2016). Handbook of Inorganic Compounds. CRC Press. p. 35. ISBN   978-1-4398-1462-8 . Retrieved 27 February 2025.
6. Haynes, William M. (9 June 2015). CRC Handbook of Chemistry and Physics, 96th Edition. CRC Press. p. 4-48. ISBN   978-1-4822-6097-7 . Retrieved 27 February 2025.
7. "Ammonium tetrathiotungstate". Chem-Impex. Retrieved 27 February 2025.
8. Hunyadi, Dávid; Vieira Machado Ramos, Ana Luisa; Szilágyi, Imre Miklós (1 April 2016). "Erratum to: Thermal decomposition of ammonium tetrathiotungstate". Journal of Thermal Analysis and Calorimetry . 124 (1): 567. doi:10.1007/s10973-016-5353-6. ISSN   1588-2926 . Retrieved 27 February 2025.