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Gold(III) oxide

Gold(III) oxide
Au2O3structure.jpg
Names
IUPAC name
Gold(III) oxide
Other names
Gold trioxide, Gold sesquioxide
Identifiers
1303-58-8 YesY
ECHA InfoCard 100.013.748
PubChem 164805
Properties
Au2O3
Molar mass 441.93
Appearance red-brown solid
Density 11.34 g/cm3 at 20 °C
Melting point 160 °C (320 °F; 433 K) (decomposes)
insoluble in water, soluble in hydrochloric and nitric acid
Structure
Orthorombic, oF40
Fdd2, No. 43
Hazards
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YesYN ?)
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. The hydrated form is weakly acidic and dissolves in concentrated alkali to form salts that are believed to contain the Au(OH)4− ion.

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.




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