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.
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| Names | |
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| Other names
cobalt violet, cobalt(II) phosphate, cobalt orthophosphate, Pigment Violet 14 | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.033.309 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| 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 | |
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 | |
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
- 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.CS1 maint: uses authors parameter (link)
- 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.CS1 maint: uses authors parameter (link)
- 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.CS1 maint: uses authors parameter (link)
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