Cobalt(II) phosphate

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.
Cobalt(II) phosphate
Names
Other names
cobalt violet, cobalt(II) phosphate, cobalt orthophosphate, Pigment Violet 14
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.309
EC Number
  • 236-655-6
Properties
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)
insoluble
28,110.0·10−6 cm3/mol
1.7
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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

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.CS1 maint: uses authors parameter (link)
  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 (4): 372–7. Bibcode:1975JSSCh..14..372A. doi:10.1016/0022-4596(75)90058-4.CS1 maint: uses authors parameter (link)
  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. doi:10.3891/acta.chem.scand.37a-0715.CS1 maint: uses authors parameter (link)
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