Potassium cobaltinitrite

Potassium cobaltinitrite

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Names
IUPAC name Potassium hexanitritocobaltate(III)
Identifiers
CAS Number	13782-01-9 Y
Jmol 3D model	Interactive image
PubChem	25022080
InChI InChI=1S/Co.3K.6HNO2.H2O/c;;;;6*2-1-3;/h;;;;6*(H,2,3);1H2/q+3;3*+1;;;;;;;/p-6
SMILES N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].N(=O)[O-].[K+].[K+].[K+].[Co]
Properties
Chemical 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)
Vapor pressure	{{{value}}}
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, and it is used as a yellow pigment called Aureolin.

See also

• Sodium cobaltinitrite