Gold(III) oxide

Gold(III) oxide
Names
	IUPAC name Gold(III) oxide
	Other names Gold trioxide, Gold sesquioxide, Auric oxide
Identifiers
CAS Number	1303-58-8 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.748
PubChem CID	164805;
UNII	LW5Y686RUP ;
CompTox Dashboard (EPA)	DTXSID20926672 ;
	InChI InChI=1S/2Au.3O/q2+3;3-2 Key: DDYSHSNGZNCTKB-UHFFFAOYSA-N;
	SMILES [O-2].[O-2].[O-2].[Au+3].[Au+3];
Properties
Chemical formula	Au2O3
Molar mass	441.93
Appearance	red-brown solid
Density	11.34 g/cm3 at 20 °C[1]
Melting point	160 °C (320 °F; 433 K) (decomposes)
Solubility in water	insoluble in water, soluble in hydrochloric and nitric acid
Structure
Crystal structure	Orthorombic, oF40
Space group	Fdd2, No. 43[1]
Hazards
NFPA 704 (fire diamond)	0 1 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 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]

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.
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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[struct-1] 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.

[Greenwood-2] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[3] 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.