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 ;
3D model (JSmol)	Interactive image;
EC Number	215-156-7;
PubChem CID	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/cm3
Melting point	895 °C (1,643 °F; 1,168 K)
Solubility in water	negligible
Magnetic susceptibility (χ)	+4560.0·10−6 cm3/mol
Structure
Crystal structure	Corundum, hR30
Space group	R3c, No. 167
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	-577 kJ/mol
Hazards
Main hazards	toxic
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H302, H317, H351, H410
GHS precautionary statements	P280
NFPA 704 (fire diamond)	0 3 0 OX
	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. Although only two oxides of cobalt are well characterized, CoO and Co₃O₄,^[4] procedures claiming to give Co₂O₃ have been described. Thus treatment of Co(II) salts such as cobalt(II) sulfate with an aqueous solution of sodium hypochlorite (also known as bleach) gives a black solid:^[5]^[6]

2CoSO₄ + 4NaOH + NaOCl → Co₂O₃ + 2Na₂SO₄ + NaCl

Some formulations of the catalyst hopcalite contain "Co₂O₃".

Some studies have been unable to synthesize the compound, and report that it is theoretically unstable.^[7]

It is soluble in cold diluted sulfuric acid and produces Co₂[SO₄]₃, which is blue in aqueous solution.

Co₂O₃ + 3H₂SO₄ → Co₂[SO₄]₃ + 3H₂O

Cobalt(III) ion is a strong oxidizer in acidic solution, its standard electrode potential is +1.84V in this situation.^[8]

References

↑ Sigma-Aldrich product page
↑ Lide, David R., ed (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
↑ "1308-04-9 CAS MSDS (COBALT(III) OXIDE BLACK) Melting Point Boiling Point Density CAS Chemical Properties". http://www.chemicalbook.com/ChemicalProductProperty_US_CB4291419.aspx.
↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
↑ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1675.
↑ Hüttner, Erwin (1901-05-02). "Beiträge zur Kenntnis der Oxyde des Kobalts" (in de). Zeitschrift für anorganische Chemie (Wiley) 27 (1): 81–124. doi:10.1002/zaac.19010270113. ISSN 0863-1778. https://zenodo.org/record/2455069.
↑ Shanbhag, Pavitra N.; Biswas, Raju K.; Pati, Swapan K.; Sundaresan, Athinarayanan; Rao, Chinthamani Nagesa Ramachandra (2020-11-02). "Elusive Co2O3: A Combined Experimental and Theoretical Study". ACS Omega (American Chemical Society (ACS)) 5 (45): 29009–29016. doi:10.1021/acsomega.0c03397. ISSN 2470-1343. PMID 33225132.
↑ Guoqing, Wu (2003). 无机化学 (Inorganic Chemistry) (4th ed.). People's Republic of China: 高等教育出版社 (Higher Education Press). p. 781. ISBN 9787040115833.

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[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] "1308-04-9 CAS MSDS (COBALT(III) OXIDE BLACK) Melting Point Boiling Point Density CAS Chemical Properties". http://www.chemicalbook.com/ChemicalProductProperty_US_CB4291419.aspx.

[4] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[5] Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1675.

[6] Hüttner, Erwin (1901-05-02). "Beiträge zur Kenntnis der Oxyde des Kobalts" (in de). Zeitschrift für anorganische Chemie (Wiley) 27 (1): 81–124. doi:10.1002/zaac.19010270113. ISSN 0863-1778. https://zenodo.org/record/2455069.

[7] Shanbhag, Pavitra N.; Biswas, Raju K.; Pati, Swapan K.; Sundaresan, Athinarayanan; Rao, Chinthamani Nagesa Ramachandra (2020-11-02). "Elusive Co2O3: A Combined Experimental and Theoretical Study". ACS Omega (American Chemical Society (ACS)) 5 (45): 29009–29016. doi:10.1021/acsomega.0c03397. ISSN 2470-1343. PMID 33225132.

[8] Guoqing, Wu (2003). 无机化学 (Inorganic Chemistry) (4th ed.). People's Republic of China: 高等教育出版社 (Higher Education Press). p. 781. ISBN 9787040115833.

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Cobalt(Iii) Oxide

See also

References