Cobalt(III) nitrate

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;32-1(3)4/q+3;3-1 Key: JGDIMKGYTAZXOY-UHFFFAOYSA-N InChI=1/Co.3NO3/c;32-1(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

Chemical compound

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]

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]

References

^ ^a ^b W. Levason and C. A. McAuliffe (1974): "Higher oxidation state chemistry of iron, cobalt, and nickel". Coordination Chemistry Reviews, volume 12, issue 2, pages 151-184. doi:10.1016/S0010-8545(00)82026-3
^ ^a ^b ^c E. Stumpp, G. Nietfeld, K. Steinwede, and K. D. Wageringel (1983) "Reaction of anhydrous metal nitrates with graphite". Synthetic Metals, Evolume 7, issues 1–2, pages 143-151. doi:10.1016/0379-6779(83)90097-8
^ ^a ^b ^c R. J. Fereday, N. Logan and D. Sutton (1969): "Anhydrous cobalt(III) nitrate: preparation, spectra, and reactions with some organic ligands". Journal of the Chemical Society A: Inorganic, Physical, Theoretical, volume 1969, issue 0, pages 2699-2703. doi:10.1039/J19690002699
^ ^a ^b J. Hilton and S. C. Wallwork (1968): "The crystal structure of cobalt(III) nitrate", Chemical Communications, volume 1968, issue 15, pages 871-871. doi:10.1039/C19680000871