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Gold(III) oxide - Wikipedia

  • ️Tue Nov 15 2016

From Wikipedia, the free encyclopedia

Gold(III) oxide
Names
IUPAC name

Gold(III) oxide

Other names

Gold trioxide, Gold sesquioxide, Auric oxide

Identifiers

3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.748 Edit this at Wikidata
EC Number
  • 215-122-1
UNII

  • InChI=1S/2Au.3O/q2*+3;3*-2

    Key: DDYSHSNGZNCTKB-UHFFFAOYSA-N

  • [O-2].[O-2].[O-2].[Au+3].[Au+3]

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
GHS labelling:[1]
GHS07: Exclamation mark
Warning
H315, H319
P264, P264+P265, P280, P302+P352, P305+P351+P338, P321, P332+P317, P337+P317, P362+P364
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond

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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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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]

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]

  1. ^ a b c 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. ^ 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. 89 (11). The Chemical Society of Japan: 1385–1390. doi:10.1246/bcsj.20160228. ISSN 0009-2673.
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  4. ^ 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.