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

ECHA InfoCard | 100.013.776
EC Number |

* 215-153-0

PubChem CID

* 10103133

UNII |

* S42YMM16W7

CompTox Dashboard (EPA)

* DTXSID50926862

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 labelling:

Pictograms

Signal word

| Danger

Hazard statements

| H319, H334, H413

Precautionary statements

| P261, P264, P273, P280, P285, P304+P341, P305+P351+P338, P337+P313, P342+P311, P501

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

Infobox references

Chemical compound

Cobalt(III) hydroxide or cobaltic hydroxide is a chemical compound with formula Co(OH)
3 or H
3CoO
3. 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[edit]

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

## See also[edit]

* Cobalt(II) hydroxide Co(OH)

* Cobalt(III) oxyhydroxide CoO(OH)

## References[edit]

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".
4. ^ "List of Minerals". 21 March 2011.

* v
* t
* e

Cobalt compounds

Cobalt(I)|

* HCo(CO)4

Cobalt(II)|

* CoBr2
* Co(CN)2
* CoCO3
* CoC2O4
* CoCl2
* Co(ClO3)2
* CoF2
* Co(HCO2)2
* CoI2
* Co(NO3)2
* Co3(PO4)2
* Co(OAc)2
* CoGeO3
* CoO
* Co(OH)2
* CoS
* CO(SCN)2
* CoSO4
* CoSe
* Co3P2
* CoH2
* Co(C3H6O3)2
* C
24H
48CoO

* C
36H
70CoO

Cobalt(0, III)|

* CoSi
* CoGe

Cobalt(II, III)|

* Co3O4

Cobalt(III)|

* CoAs
* CoCl3
* Co(NO3)3
* Co2O3
* CoF3
* Co(OH)3
* LiCoO2

Cobalt(III,IV)|

* NaxCoO2

Cobalt(IV)|

* Cs2CoF6
* CoC28H44

Cobalt(V)|

* Na3CoO4

*[CID]: Compound ID
*[EPA]: U.S. Environmental Protection Agency
*[H319]: H319: Causes serious eye irritation
*[H334]: H334: May cause allergy or asthma symptoms of breathing difficulties if inhaled
*[H413]: H413: May cause long lasting harmful effects to aquatic life
*[P261]: P261: Avoid breathing dust/fume/gas/mist/vapours/spray.
*[P264]: P264: Wash ... thoroughly after handling.
*[P273]: P273: Avoid release to the environment.
*[P280]: P280: Wear protective gloves/protective clothing/eye protection/face protection.
*[P285]: P285: In case of inadequate ventilation wear respiratory protection.
*[P304+P341]: P304+P341: IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing.
*[P305+P351+P338]: P305+P351+P338: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.
*[P337+P313]: P337+P313: If eye irritation persists: Get medical advice/attention.
*[P342+P311]: P342+P311: If experiencing respiratory symptoms: Call a POISON CENTER or doctor/physician.
*[P501]: P501: Dispose of contents/container to ...
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