Cobalt(III) oxide

Cobalt(III) oxide^[1]

Names
IUPAC name cobalt(III) oxide, dicobalt trioxide
Other names cobaltic oxide, cobalt sesquioxide
Identifiers
CAS Number	1308-04-9
EC Number	215-156-7
Jmol interactive 3D	Image
PubChem	4110762
RTECS number	GG2900000
InChI InChI=1S/2Co.3O Key: UPWOEMHINGJHOB-UHFFFAOYSA-N
SMILES O=[Co]O[Co]=O
Properties
Chemical formula	Co2O3
Molar mass	165.8646 g/mol
Appearance	red powder
Density	5.18 g/cm^3 [2]
Melting point	1,900 °C (3,450 °F; 2,170 K)
Solubility in water	negligible
Structure
Crystal structure	Trigonal, hR30
Space group	R-3c, No. 167
Thermochemistry
Std enthalpy of formation (ΔfH^o298)	-577 kJ/mol
Hazards
R-phrases	R22 R40 R43
S-phrases	S36/37
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

Cobalt (III) oxide is the inorganic compound with the formula of Co₂O₃. Most commonly used in bleach. Although only two oxides of cobalt are well characterized, CoO and Co₃O₄,^[3] procedures claiming to give Co₂O₃ have been described. Thus treatment of Co(II) salts such as cobalt(II) nitrate with an aqueous solution of sodium hypochlorite (also known as bleach) gives a black solid.^[4] Some formulations of the catalyst hopcalite contain "Co₂O₃".

See also

• Cobalt Oxide Nanoparticles

References

1. Sigma-Aldrich product page
2. Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
3. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
4. Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1675.