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]
Names | |
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Other names cobalt violet, cobalt(II) phosphate, cobalt orthophosphate, Pigment Violet 14 | |
Identifiers | |
3D model (JSmol) | |
ChemSpider | |
ECHA InfoCard | 100.033.309 |
EC Number |
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PubChem CID | |
UNII | |
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 | |
Solubility product (Ksp) | 2.05×10−35[1] |
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). |
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
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