Gold(III) oxide
Gold(III) oxide (Au2O3) is an inorganic compound of gold and oxygen with the formula Au2O3. It is a red-brown solid that decomposes at 298 °C.[3]
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IUPAC name
Gold(III) oxide | |
Other names
Gold trioxide, Gold sesquioxide, Auric oxide | |
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ECHA InfoCard | 100.013.748 |
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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 | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references |
According to X-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 207 picometers.[1] The crystals 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.[4]
References
- 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.
- Kawamoto, Daisuke; Ando, Hiroaki; Ohashi, Hironori; Kobayashi, Yasuhiro; Honma, Tetsuo; Ishida, Tamao; Tokunaga, Makoto; Okaue, Yoshihiro; Utsunomiya, Satoshi; Yokoyama, Takushi (2016-11-15). "Structure of a Gold(III) Hydroxide and Determination of Its Solubility". Bulletin of the Chemical Society of Japan. The Chemical Society of Japan. 89 (11): 1385–1390. doi:10.1246/bcsj.20160228. ISSN 0009-2673.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
- Jones, Peter G.; Rumpel, Horst; Sheldrick, George M.; Schwarzmann, Einhard (1980). "Gold(III) oxide and oxychloride" (open access). Gold Bulletin. 13 (2): 56. doi:10.1007/BF03215453.
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