Gold(III) oxide

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Gold(III) oxide
Au2O3structure.jpg
Identifiers
CAS number 1303-58-8 YesY
PubChem 164805
Properties
Molecular 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, SpaceGroup = Fdd2, No. 43[1]
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 noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
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[edit]

  1. ^ a b 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. 
  2. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419. 
  3. ^ Jones PG, Rumpel H, Sheldrick GM, Schwartzmann E, Gold(III) Oxide and Oxychloride, Gold Bulletin 1980, 13, 56.