Potassium cobaltinitrite

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Potassium cobaltinitrite
Potassium cobaltinitrite.svg
Cobalt yellow.jpg
IUPAC name
Potassium hexanitritocobaltate(III)
3D model (Jmol)
ECHA InfoCard 100.034.018
K3[Co(NO2)6] (anhydrous)
K3[Co(NO2)6]·1.5H2O (sesquihydrate)
Molar mass 452.26 g/mol (anhydrous)
479.284 g/mol (sesquihydrate)
Appearance yellow cubic crystals (sesquihydrate)
Density 2.6 g/cm3 (sesquihydrate)
slightly soluble in water (sesquihydrate)
Solubility reacts with acids, insoluble in ethanol (sesquihydrate)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Potassium cobaltinitrite, IUPAC name potassium hexanitritocobaltate(III), is a coordination compound with the formula K3[Co(NO2)6]. The anion of this yellow-coloured salt consists of a cobalt(III) center bound to six nitrito ligands. It is insoluble in water and is precipitated as yellow solids.

It was first made in 1848 by Nikolaus Wolfgang Fischer in Breslau,[2] and it is used as a yellow pigment called Aureolin.[3][4]

See also[edit]


  1. ^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 4–54. ISBN 0-8493-0594-2 
  2. ^ Fischer, N. W. (1848). "Ueber die salpetrichtsauren Salze". Annalen der Physik und Chemie. 150 (5): 115–125. Bibcode:1848AnP...150..115F. doi:10.1002/andp.18491500512. 
  3. ^ Gates, G. (1995). "A Note on the Artists' Pigment Aureolin". Studies in Conservation. 40 (3): 201–206. doi:10.2307/1506479. JSTOR 1506479. 
  4. ^ Gettens, Rutherford John; Stout, George Leslie (1966). Painting materials: A short encyclopaedia. pp. 109–110. ISBN 978-0-486-21597-6.