Cobalt phosphate

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;;;21-5(2,3)4/h;;;2(H3,1,2,3,4)/q3+2;;/p-6 Key: ZBDSFTZNNQNSQM-UHFFFAOYSA-H; InChI=1/3Co.2H3O4P/c;;;21-5(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]

References

↑ 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
↑ 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.
↑ 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.
↑ 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.

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[Ullmann-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.

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Cobalt phosphate

Topic: Chemistry

Preparation and structure

See also

References