Cobalt(III) nitrate

Cobalt(III) nitrate is an inorganic compound with the chemical formula Co(NO₃)₃.^[1] It is a green, diamagnetic solid that sublimes at ambient temperature.^[2]

Cobalt(III) nitrate

Names
IUPAC name Cobalt(III) nitrate
Identifiers
CAS Number	15520-84-0
3D model (JSmol)	Interactive image
ChemSpider	9869156
ECHA InfoCard	100.290.572
PubChem CID	11694431
CompTox Dashboard (EPA)	DTXSID20941087
InChI InChI=1S/Co.3NO3/c;3*2-1(3)4/q+3;3*-1 Key: JGDIMKGYTAZXOY-UHFFFAOYSA-N InChI=1/Co.3NO3/c;3*2-1(3)4/q+3;3*-1 Key: JGDIMKGYTAZXOY-UHFFFAOYAI
SMILES [Co+3].O=[N+]([O-])[O-].[O-] [N+]([O-])=O.[O-] [N+]([O-])=O
Properties
Chemical formula	Co(NO3)3
Molar mass	244.96 g/mol
Appearance	green crystals hygroscopic
Density	2.49 g/cm3
Solubility in water	5.07 g/100 mL
Structure
Crystal structure	cubic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Structure

The compound is a molecular coordination complex. The three bidentate nitrate ligands give a distorted octahedral arrangement.^[3] The nitrate ligands are planar. With D₃ symmetry, the molecule is chiral. The Co-O bond lengths are about 190 pm long. The O-Co-O angles for the chelating oxygen atoms in the same nitrate anion is about 68 degrees.^[4] The same geometry seems to persist in carbon tetrachloride solution.^[3]

Preparation and reactions

Cobalt(III) nitrate can be prepared by the reaction of dinitrogen pentoxide N
₂O
₅ with cobalt(III) fluoride CoF
₃.^[3] It can be purified by vacuum sublimation at 40 °C.^[4][2]

Cobalt(III) nitrate oxidizes water, the initial green solution rapidly turns pink, with formation of cobalt(II) ions and release of oxygen.^[1] Cobalt(III) nitrate can be intercalated in graphite, in the ratio of 1 molecule for each 12 carbon atoms.^[2]

See also

• Cobalt(III) fluoride
• Cobalt(III) chloride
• Cobalt(III) hydroxide
• Iron(III) nitrate
• Iron(III) oxalate