Potassium cobaltinitrite

Potassium cobaltinitrite
IUPAC name Potassium hexanitritocobaltate(III)
Identifiers
CAS number	13782-01-9
PubChem	25022080
Jmol-3D images	Image 1
SMILES N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].[K+].[K+].[K+].[Co]
InChI InChI=1S/Co.3K.6HNO2.H2O/c;;;;6*2-1-3;/h;;;;6*(H,2,3);1H2/q+3;3*+1;;;;;;;/p-6
Properties
Molecular formula	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)
Solubility in water	slightly soluble in water (sesquihydrate)
Solubility	reacts with acids, insoluble in ethanol (sesquihydrate)[1]
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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 N. W. Fischer in Breslau^[2] and it is used as a yellow pigment called Aureolin.^[3][4]

See also

• Sodium cobaltinitrite

References

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