Gold(III) oxide
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| Gold(III) oxide | |
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Gold(III) oxide |
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Other names
Gold trioxide, Gold sesquioxide |
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| Identifiers | |
| CAS number | 1303-58-8  |
| PubChem | 164805 |
| Properties | |
| Molecular formula | Au2O3 |
| Molar mass | 441.93 |
| Appearance | red-brown solid |
| Density | 11.34 g/cm3 at 20 °C[1] |
| Melting point |
decomposes at 160 °C |
| Solubility in water | insoluble in water, soluble in hydrochloric and nitric acid |
| Structure | |
| Crystal structure | Orthorombic, oF40, SpaceGroup = Fdd2, No. 43[1] |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Gold(III) oxide (Au2O3) is the most stable oxide of gold. It is a red-brown, thermally unstable solid that decomposes at 160 °C.[2] The hydrated form is weakly acidic and dissolves in concentrated alkali to form salts that are believed to contain the [Au(OH)4]− ion.[2]
Anhydrous Au2O3 can be prepared by heating amorphous hydrated gold(III) oxide with perchloric acid and an alkali metal perchlorate in a sealed quartz tube at a temperature of around 250 °C and a pressure of around 30 MPa.[3]
Gold oxide is used to make highly-valued red-coloured or cranberry glass, which, like colloidal gold suspensions, contains evenly-sized spherical gold nanoparticles.
[edit] References
- ^ a b Jones, P. G.; Rumpel, H.; Schwarzmann, E.; Sheldrick, G. M.; Paulus, H. (1979). "Gold(III) oxide". Acta Crystallographica Section B 35 (6): 1435. doi:10.1107/S0567740879006622.
- ^ a b Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.
- ^ Jones PG, Rumpel H, Sheldrick GM, Schwartzmann E, Gold(III) Oxide and Oxychloride, Gold Bulletin 1980, 13, 56.
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