Cobalt(III) nitrate

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Cobalt(III) nitrate
Co(NO3)3.svg
Names
IUPAC name
Cobalt(III) nitrate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.290.572 OOjs UI icon edit-ltr-progressive.svg
PubChem CID
  • 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
  • [Co+3].O=[N+]([O-])[O-].[O-] [N+]([O-])=O.[O-] [N+]([O-])=O
Properties
Co(NO3)3
Molar mass 244.96 g/mol
Appearancegreen crystals
hygroscopic
Density 2.49 g/cm3
5.07 g/100 mL
Structure
cubic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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]

Contents

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

References

  1. 1 2 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
  2. 1 2 3 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
  3. 1 2 3 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
  4. 1 2 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


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