Gold(III) sulfide
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.[1] Only the amorphous phase has been produced, and the only evidence of existence is based on thermal analysis.
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| IUPAC name Gold(III) sulfide | |
| Other names Auric sulfide, Gold trisulfide, Digold trisulfide | |
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| ECHA InfoCard | 100.013.750 |
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| Properties | |
| Au2S3 | |
| Molar mass | 490.11 g·mol−1 |
| Appearance | Black powder |
| Density | 8.750 g/cm3 |
| Insoluble | |
| Hazards | |
| GHS labelling: | |
| Warning | |
| H315, H319, H335 | |
| 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 [77 °F], 100 kPa). | |
Claims edit
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:[2][3][1]
- 8 Au3+ + 3 S2− + 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:[1]
- 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.[3]
Auric sulfide is claimed to react with nitric acid as well sodium cyanide. It is claimed to dissolve in concentrated sodium sulfide solution.[1]
See also edit
References edit
- ^ a b c d 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 Au2S3" [On the gold sulfide Au2S3]. Gazzetta Chimica Italiana (in Italian): 601–606 – via HathiTrust.
- ^ a b 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.