Cobalt(III) nitrate

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Cobalt(III) nitrate
Names
IUPAC name
Cobalt(III) nitrate
Identifiers
3D model (JSmol)
ChemSpider
Properties
Co(NO3)3
Molar mass 244.96 g/mol
Appearance green 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).
Infobox references

Cobalt(III) nitrate is an inorganic compound with the chemical formula Co(NO3)3.[1]

Properties[edit]

Cobalt(III) nitrate is a stable green crystalline solid,[2] that sublimates at ambient temperature.[3] It is soluble in chloroform.[4]

Structure[edit]

The molecular structure has three nitrate groups in bidentate coordination with the cobalt atom, which is thus bonded to six oxygen atoms in a distorted octahedral arrangement.[4] The nitrates are approximately planar, and lie on three mutually perpendicular planes, resulting in a chiral molecule. The Co-O bonds are about 190 pm long. The O-Co-O angles for the two oxygens in the same nitrate is about 68 degrees.[5] The same geometry seems to persist in carbon tetrachloride solution.[4]

Preparation[edit]

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

Reactions[edit]

Cobalt(III) nitrate is soluble in water, giving a green solution that rapidly turns pink, with formation of cobalt(II) ions and release of oxygen.[2]

Cobalt(III) nitrate can be intercalated in graphite, in the ratio of 1 molecule for each 12 carbon atoms, by heating the two substances at 40 °C for 3 hours.[3]

See also[edit]

References[edit]

  1. ^ University of Akron Chemical Database Archived 2012-12-11 at Archive.today
  2. ^ 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
  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
  4. ^ a b c d 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
  5. ^ a b J. Hilton and S. C. Wallwork (1968): "The crystal structure of cobalt(III) nitrate", Chemical Communications (London), volume 1968, issue 15, pages 871-871. doi:10.1039/C19680000871
Salts and covalent derivatives of the nitrate ion