 | |
| Names | |
|---|---|
| IUPAC name Gold(III) oxide | |
| Other names Gold trioxide, Gold sesquioxide, Auric oxide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.013.748 |
| EC Number |
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| UNII | |
| |
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| Properties | |
| Au2O3 | |
| Molar mass | 441.93 |
| Appearance | red-brown solid |
| Density | 11.34 g/cm3 at 20 °C[1] |
| Melting point | 298 °C (568 °F; 571 K)[2] |
| insoluble in water, soluble in hydrochloric and nitric acid | |
| Structure | |
| Orthorhombic,oF40 | |
| =Fdd2, No. 43[1] | |
| Hazards | |
| GHS labelling:[1] | |
 | |
| Warning | |
| H315,H319 | |
| P264,P264+P265,P280,P302+P352,P305+P351+P338,P321,P332+P317,P337+P317,P362+P364 | |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Gold(III) oxide (Au2O3) is aninorganic compound ofgold andoxygen with the formula Au2O3. It is a red-brown solid that decomposes at 298 °C.[3]
According toX-ray crystallography, Au2O3 features square planar gold centers with both 2- and 3-coordinated oxides. The four Au-O bond distances range from 193 to 207picometers.[1] The crystals can be prepared by heating amorphous hydrated gold(III) oxide withperchloric acid and analkali metalperchlorate in a sealedquartz tube at a temperature of around 250 °C and a pressure of around 30 MPa.[4]
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