Chemistry:Cobalt(II) phosphate
From HandWiki
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_phosphate.JPG)
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| Names | |
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| Other names
cobalt violet, cobalt(II) phosphate, cobalt orthophosphate, Pigment Violet 14
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3D model (JSmol)
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PubChem CID
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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 | |
Solubility product (Ksp)
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2.05×10−35[1] |
| 28,110.0·10−6 cm3/mol | |
Refractive index (nD)
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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.[2] Thin films of this material are water oxidation catalysts.[3]
Preparation and structure
The tetrahydrate Co3(PO4)2•4H2O precipitates as a solid upon mixing aqueous solutions of cobalt(II) and phosphate salts.[4][5] 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.[6][7]
See also
References
- ↑ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99th ed.). CRC Press. pp. 5–188. ISBN 978-1138561632.
- ↑ 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.
- ↑ Donaldson, John Dallas; Beyersmann, Detmar (2005). "Cobalt and Cobalt Compounds". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a07_281.pub2. ISBN 9783527303854.
- ↑ Sankar, Selvasundarasekar Sam; Rathishkumar, Arumugam; Geetha, Kathiresan; Kundu, Subrata (2020-10-15). "A Simple Route for the Synthesis of Cobalt Phosphate Nanoparticles for Electrocatalytic Water Oxidation in Alkaline Medium". Energy & Fuels 34 (10): 12891–12899. doi:10.1021/acs.energyfuels.0c02809. ISSN 0887-0624.
- ↑ 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. doi:10.1016/0022-4596(75)90058-4. Bibcode: 1975JSSCh..14..372A.
- ↑ 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.
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