Cobalt(II) phosphate

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Cobalt(II) phosphate
EntryWithCollCode38260.png
Cobalt(II) phosphate.JPG
Names
Other names
cobalt violet, cobalt(II) phosphate, cobalt orthophosphate, Pigment Violet 14
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.309 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 236-655-6
PubChem CID
UNII
  • InChI=1S/3Co.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6
    Key: ZBDSFTZNNQNSQM-UHFFFAOYSA-H
  • InChI=1/3Co.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6
    Key: ZBDSFTZNNQNSQM-CYFPFDDLAU
  • [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Co+2].[Co+2].[Co+2]
Properties
Co3(PO4)2
Molar mass 366.74231 g/mol
Appearanceviolet solid
Density 3.81 g/cm3
Melting point 1,160 °C (2,120 °F; 1,430 K)
insoluble
2.05×1035 [1]
28,110.0·10−6 cm3/mol
1.7
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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]

Contents

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

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

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Cobalt(II) sulfate is any of the inorganic compounds with the formula CoSO4(H2O)x. Usually cobalt sulfate refers to the hexa- or heptahydrates CoSO4.6H2O or CoSO4.7H2O, respectively. The heptahydrate is a red solid that is soluble in water and methanol. Since cobalt(II) has an odd number of electrons, its salts are paramagnetic.

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<span class="mw-page-title-main">Nickel oxyacid salts</span>

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Cobalt compounds are chemical compounds formed by cobalt with other elements.

References

  1. John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99th ed.). CRC Press. pp. 5–188. ISBN   978-1138561632.
  2. 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
  3. 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.
  4. 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.
  5. 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. S2CID   224960926.
  6. 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.
  7. 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 .