Cobalt phosphate
_phosphate.JPG) | |
| Names | |
|---|---|
| Other names
cobalt violet, cobalt(II) phosphate, cobalt orthophosphate, Pigment Violet 14 | |
| Identifiers | |
| (tetrahydrate: 10294-50-5) 13455-36-2 (tetrahydrate: 10294-50-5) | |
| 3D model (Jmol) | Interactive image |
| ChemSpider | 55523 |
| ECHA InfoCard | 100.033.309 |
| EC Number | 236-655-6 |
| PubChem | 61615 |
| |
| |
| Properties | |
| Co3O8P2 | |
| 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 | |
| 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 catalyze the decomposition of water.[2]
A swatch of cobalt violet, popular among the French impressionists.
Preparation and structure
It precipitates as a solid tetrahydrate upon mixing aquous solutions of cobalt(II) and phosphate salts. The anhydrous material 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]
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 "Cobalt–phosphate oxygen-evolving compound" Chem. Soc. Rev., 2009, volume 38, 109-114. doi:10.1039/B802885K
- ↑ Anderson, J. B.; Kostiner, E.; Miller, M. C.; Rea, J. R. "Crystal structure of cobalt orthophosphate Co3(PO4)2" Journal of Solid State Chemistry 1975, vol. 14, 372-7.
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