Cobalt(III) hydroxide

Cobalt(III) hydroxide  Names

IUPAC name

Cobalt(III) hydroxide

Other names

Cobaltic hydroxide

Identifiers

CAS Number

* 1307-86-4 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 8278661 Y

EC Number |

* 215-153-0

PubChem CID

* 10103133

UNII |

* S42YMM16W7

InChI

* InChI=1S/Co.3H2O/h;3*1H2/q+3;;;/p-3 Y[pubchem]

Key: FXVNMSSSMOVRTC-UHFFFAOYSA-K Y[pubchem]

SMILES

* [OH-].[OH-].[OH-].[Co+3]

Properties

Chemical formula

| Co(OH)3
Molar mass | 109.95522 g
Appearance  | brown-black or dark green powder
Hazards
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H319, H334, H413

GHS precautionary statements

| P261, P264, P273, P280, P285, P304+341, P305+351+338, P337+313, P342+311, P501

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

Infobox references

Cobalt(III) hydroxide or cobaltic hydroxide is a chemical compound with formula Co(OH)3 or H3CoO3. It is an ionic compound, with trivalent cobalt cations Co3+ and hydroxyl anions OH−.

The compound is known in two structurally different forms, "brownish-black" and "green". The brownish-black form is a stable solid and can be prepared by reaction of water solutions of cobalt(II) chloride and sodium hydroxide, followed by oxidation with ozone.[1]

The green form, formerly thought to be cobalt(II) peroxide, apparently requires carbon dioxide as a catalyst. It can be prepared by adding hydrogen peroxide to a solution of cobalt(II) chloride in 96% ethanol at –30 to –35°C, then adding a 15% solution of sodium carbonate in water with intense stirring. The resulting dark green powder is fairly stable at liquid nitrogen temperature, but at room temperature it turns dark brown within a few days.[2]

## Natural occurrence

As of 2020, Cobalt(III) hydroxide is unknown among the known mineral species. However, heterogenite, CoO(OH), is known.[3][4]

## See also

* Cobalt(II) hydroxide Co(OH)2
* Cobalt(III) oxyhydroxide CoO(OH)

## References

1. ↑ Pankratov, D.A., Veligzhanin, A.A., and Zubavichus, Y.V. (2013): "Structural Features of Green Cobalt(III) Hydroxide". Russian Journal of Inorganic Chemistry, volume 58, issue 1, pages 67–73. doi:10.1134/S0036023613010142
2. ↑ Pankratov, D.A., Portachenko, T.A., and Perfil’ev, Y.D. (2008): "Emission Mössbauer Study of 'Cobalt Peroxide'". Moscow University Chemical Bulletin, volume 63, issue 5, pages 292–296. doi:10.3103/S002713140805012X
3. ↑ "Heterogenite". https://www.mindat.org/min-1885.html.
4. ↑ "List of Minerals". 21 March 2011. https://www.ima-mineralogy.org/Minlist.htm.

* 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

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*[CID]: Compound ID
*[H319]: Causes serious eye irritation
*[H334]: May cause allergy or asthma symptoms of breathing difficulties if inhaled
*[H413]: May cause long lasting harmful effects to aquatic life
*[P261]: Avoid breathing dust/fume/gas/mist/vapours/spray
*[P264]: Wash … thoroughly after handling
*[P273]: Avoid release to the environment
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
*[P285]: In case of inadequate ventilation wear respiratory protection
*[P304+341]: IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing
*[P305+351+338]: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing
*[P337+313]: Get medical advice/attention
*[P342+311]: Call a POISON CENTER or doctor/physician
*[P501]: Dispose of contents/container to …
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