Cobalt phosphate

Names
Other names

cobalt violet, cobalt(II) phosphate, cobalt orthophosphate, Pigment Violet 14

Identifiers

CAS Number

* (tetrahydrate: 10294-50-5) 13455-36-2 (tetrahydrate: 10294-50-5)

3D model (JSmol)

* Interactive image

ChemSpider |

* 55523

EC Number |

* 236-655-6

PubChem CID

* 61615

InChI

* InChI=1S/3Co.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6

Key: ZBDSFTZNNQNSQM-UHFFFAOYSA-H

* InChI=1/3Co.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6

Key: ZBDSFTZNNQNSQM-CYFPFDDLAU

SMILES

* [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Co+2].[Co+2].[Co+2]

Properties

Chemical formula

| Co3(PO4)2
Molar mass | 366.74231 g/mol
Appearance  | violet solid
Density | 3.81 g/cm3
Melting point |  1,160 °C (2,120 °F; 1,430 K)

Solubility in water

| insoluble

Magnetic susceptibility (χ)

| 28,110.0·10−6 cm3/mol

Refractive index (nD)

| 1.7

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

Infobox references

Cobalt phosphate is the inorganic compound with the formula Co3(PO4)2. It is a commercial inorganic pigment known as cobalt violet.[1] Thin films of this material are water oxidation catalysts.[2]

A swatch of cobalt violet, popular among the French impressionists.

## Preparation and structure

The tetrahydrate Co3(PO4)2•4H2O precipitates as a solid upon mixing aqueous solutions of cobalt(II) and phosphate salts. Upon heating, the tetrahydrate converts to the anhydrous material. According to X-ray crystallography, the anhydrous Co3(PO4)2 consists of discrete phosphate (PO3−4) anions that link Co2+ centres. The cobalt ions occupy both octahedral (six-coordinate) and pentacoordinate sites in a 1:2 ratio.[3][4]

## See also

* List of inorganic pigments

## References

1. ↑ Hugo Müller, Wolfgang Müller, Manfred Wehner, Heike Liewald "Artists' Colors" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. doi:10.1002/14356007.a03_143.pub2
2. ↑ Matthew W. Kanan, Yogesh Surendranatha, Daniel G. Nocera (2009). "Cobalt–phosphate oxygen-evolving Compound". Chem. Soc. Rev. 38 (1): 109–114. doi:10.1039/B802885K. PMID 19088970.
3. ↑ Anderson, J. B.; Kostiner, E.; Miller, M. C.; Rea, J. R. (1975). "Crystal structure of cobalt orthophosphate Co3(PO4)2". Journal of Solid State Chemistry 14: 372–7.
4. ↑ Nord, A. G.; Stefanidis, T. (1983). "Structure of cobalt(II) phosphateStructure refinements of Co3(PO4)2. A Note on the Reliability of Powder Diffraction Studies". Acta Chemica Scandinavica A 37: 715–p721.

* 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

0.00

(0 votes)

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Chemistry:Cobalt_phosphate&oldid=182321"
*[CID]: Compound ID
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template