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Cobalt(II) phosphate

3 (PO 4 ) 2 \n| MolarMass = 366.74231 g/mol\n| Appearance = violet solid\n| Density = 3.81 g/cm 3 \n| MeltingPtC = 1160 \n| BoilingPtC = \n| Solubility = insoluble\n| Solubility...

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Cobalt phosphate is the inorganic compound with the formula Co3(PO4)2. It is a violet solid that is insoluble in water.

Structure

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]

Preparation

The tetrahydrate Co3(PO4)2•4H2O precipitates as a solid upon mixing aqueous solutions of cobalt(II) and phosphate salts.[5][6] Upon heating, the tetrahydrate converts to the anhydrous material.

Uses

Thin films of this material are water oxidation catalysts.[7]

It is also a commercial inorganic pigment known as cobalt violet (PV14).[8]

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

See also

References

  1. ↑John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99th ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
  2. ↑PubChem. "Cobaltous phosphate". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-03-11.
  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): 372–377. Bibcode:1975JSSCh..14..372A. doi:10.1016/0022-4596(75)90058-4.
  4. ↑Nord, A. G.; Stefanidis, T. (1983). "Structure refinements of Co3(PO4)2. A Note on the Reliability of Powder Diffraction Studies". Acta Chemica Scandinavica A. 37: 715–721. doi:10.3891/acta.chem.scand.37a-0715.
  5. ↑ Donaldson, John Dallas; Beyersmann, Detmar (2005). "Cobalto y compuestos de cobalto". Enciclopedia de química industrial de Ullmann . doi : 10.1002/14356007.a07_281.pub2 . ISBN 9783527303854.
  6. ↑ Sankar, Selvasundarasekar Sam; Rathishkumar, Arumugam; Geetha, Kathiresan; Kundu, Subrata (2020-10-15). "Una ruta simple para la síntesis de nanopartículas de fosfato de cobalto para la oxidación electrocatalítica del agua en medio alcalino". Energy & Fuels . 34 (10): 12891– 12899. doi : 10.1021/acs.energyfuels.0c02809 . ISSN 0887-0624 . S2CID 224960926 .  
  7. ↑ Matthew W. Kanan; Yogesh Surendranatha; Daniel G. Nocera (2009). "Compuesto de cobalto-fosfato que libera oxígeno". Chem. Soc. Rev. 38 ( 1): 109– 114. doi : 10.1039/B802885K . PMID 19088970 . 
  8. ↑ Hugo Müller, Wolfgang Müller, Manfred Wehner, Heike Liewald "Colores de artistas" en la Enciclopedia de química industrial de Ullmann 2002, Wiley-VCH, Weinheim. doi : 10.1002/14356007.a03_143.pub2