| Names | |
|---|---|
| IUPAC name Gold(III) sulfide | |
| Other names Auric sulfide, Gold trisulfide, Digold trisulfide | |
| Identifiers | |
| CAS Number | |
| 3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.013.750 
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| EC Number |
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| PubChem CID | |
| UNII | |
| CompTox Dashboard (EPA) | |
InChI
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SMILES
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| Properties | |
| Chemical formula | Au2S3 |
| Molar mass | 490.11 g·mol |
| Appearance | Black powder |
| Density | 8.750 g/cm |
| Solubility in water | Insoluble |
| Hazards | |
| GHS labelling: | |
| Pictograms | 
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| Signal word | Warning |
| Hazard statements | H315, H319, H335 |
| Precautionary statements | P261, P264, P271, P280, P302+P352, P304+P312, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501 |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references | |
Gold(III) sulfide or auric sulfide is an inorganic compound with the formula Au2S3. Auric sulfide has been described as a black and amorphous solid. Only the amorphous phase has been produced, and the only evidence of existence is based on thermal analysis.
Claims
Early investigations claimed to prepare auric sulfide by the reaction of lithium tetrachloroaurate with hydrogen sulfide:
- 2 Li[AuCl4] + 3 H2S → Au2S3 + 2 LiCl + 6 HCl
Similar preparations via chloroauric acid, auric chloride, or gold(III) sulfate a claimed proceed in anhydrous solvents, but water evinces a redox decomposition into metallic gold in sulfuric acid:
- 8 Au + 3 S + 12 H2O → 8 Au + 3 H2SO4 + 18 H
Conversely, it is claimed that cyclo-octasulfur reduces gold(III) sulfate to a mixture of gold sulfides and sulfur oxides:
- Au2(SO4)3 + S8 → Au2S3 + Au2S + 4 SO3 + 6 SO2
Auric sulfide has also been claimed as the product when auric acetate is sonicated with cyclo-octasulfur in decalin.
Auric sulfide is claimed to react with nitric acid as well sodium cyanide. It is claimed to dissolve in concentrated sodium sulfide solution.
See also
References
- ^ Senftle, F. E.; Wright, D. B. (December 12, 1985). "Synthesis of Au2S and Au2S3 using H2S, short-chain and ring-structured sulfur as sulfur sources" (PDF). Zeitung für Naturforschung. 41 (41b): 1081–1084. doi:10.1515/znb-1986-0904. S2CID 95736401.
- Antony, U.; Lucchesi, A. (11 July 1890). "Del sulfuro aurico AuS" [On the gold sulfide AuS]. Gazzetta Chimica Italiana (in Italian): 601–606 – via HathiTrust.
- ^ Kristl, M.; Drofenik, M. (2003). "Preparation of Au2S3 and nanocrystalline gold by sonochemical method". Inorganic Chemistry Communications. 6 (12): 1419–1422. doi:10.1016/j.inoche.2003.08.027.
| Gold compounds | |||
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| Gold(-I) | |||
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| Gold(I,III) | |||
| Gold(III) |
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