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 Y

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 [2]
Melting point |  895[3] °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)  |

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

N verify (what is YN ?)
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]

## 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. ↑ "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.

* v
* t
* e

Cobalt compounds

* CoBr2
* Co(CN)2
* CoCO3
* CoC2O4
* CoCl2
* CoCl3
* Co(ClO3)2
* CoF2
* CoF3
* CoI2
* Co(NO3)2
* Co(NO3)3
* CoO
* Co(OH)2
* CoS
* CoSO4
* CoSe
* Co2O3
* Co2P
* Co3O4
* Co3(PO4)2
* Co(Ac)2

* v
* t
* e

Oxygen compounds

* AgO
* Al2O3
* AmO2
* Am2O3
* As2O3
* As2O5
* Au2O3
* B2O3
* BaO
* BeO
* Bi2O3
* BiO2
* Bi2O5
* BrO2
* Br2O3
* Br2O5
* CO
* CO2
* C2O3
* CaO
* CaO2
* CdO
* CeO2
* Ce3O4
* Ce2O3
* ClO2
* Cl2O
* Cl2O3
* Cl2O4
* Cl2O6
* Cl2O7
* CoO
* Co2O3
* Co3O4
* CrO3
* Cr2O3
* Cr2O5
* Cr5O12
* CsO2
* Cs2O3
* CuO
* D2O
* Dy2O3
* Er2O3
* Eu2O3
* FeO
* Fe2O3
* Fe3O4
* Ga2O
* Ga2O3
* GeO
* GeO2
* H2O
* H218O
* H2O2
* HfO2
* HgO
* Hg2O
* Ho2O3
* I2O4
* I2O5
* I2O6
* I4O9
* In2O3
* IrO2
* KO2
* K2O2
* La2O3
* Li2O
* Li2O2
* Lu2O3
* MgO
* Mg2O3
* MnO
* MnO2
* Mn2O3
* Mn2O7
* MoO2
* MoO3
* Mo2O3
* NO
* NO2
* N2O
* N2O3
* N2O4
* N2O5
* NaO2
* Na2O
* Na2O2
* NbO
* NbO2
* Nd2O3
* OF2
* O2F2
* O3F2
* O4F2
* O2PtF6

Chemical formulas

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*[CID]: Compound ID
*[H302]: Harmful if swallowed
*[H317]: May cause an allergic skin reaction
*[H351]: Suspected of causing cancer
*[H410]: Very toxic to aquatic life with long lasting effects
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
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