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;
ChemSpider	144478;
ECHA InfoCard	100.013.748
EC Number	215-122-1;
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
Melting point	298 °C (568 °F; 571 K)
Solubility in water	insoluble in water, soluble in hydrochloric and nitric acid
Structure
Crystal structure	Orthorhombic, oF40
Space group	= Fdd2, No. 43
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319
Precautionary statements	P264, P264+P265, P280, P302+P352, P305+P351+P338, P321, P332+P317, P337+P317, P362+P364
NFPA 704 (fire diamond)	1 0 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

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.

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. 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.