Cobalt(III) nitrate
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| ImageFile = Co(NO3)3.svg
| ImageSize =
| IUPACName = Cobalt(III) nitrate
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|Section1={{Chembox Identifiers
| CASNo = 15520-84-0
| RTECS =
| EINECS =
| PubChem = 11694431
| ChemSpiderID = 9869156
| SMILES = [Co+3].O=[N+]([O-])[O-].[O-] [N+]([O-])=O.[O-] [N+]([O-])=O
| InChI = 1/Co.3NO3/c;3*2-1(3)4/q+3;3*-1
| InChIKey = JGDIMKGYTAZXOY-UHFFFAOYAI
| StdInChI = 1S/Co.3NO3/c;3*2-1(3)4/q+3;3*-1
| StdInChIKey = JGDIMKGYTAZXOY-UHFFFAOYSA-N
}}
|Section2={{Chembox Properties
| Formula = Co(NO3)3
| MolarMass = 244.96 g/mol
| Appearance = green crystals
hygroscopic
| Density = 2.49 g/cm3
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| BoilingPtC =
| Solubility = 5.07 g/100 mL
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|Section3={{Chembox Structure
| CrystalStruct = cubic
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|Section4={{Chembox Hazards
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Cobalt(III) nitrate is an inorganic compound with the chemical formula Co(NO3)3.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}} It is a green, diamagnetic solid that sublimes at ambient temperature.
Structure
The compound is a molecular coordination complex. The three bidentate nitrate ligands give a distorted octahedral arrangement. 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. The same geometry seems to persist in carbon tetrachloride solution.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}}
Preparation and reactions
Cobalt(III) nitrate can be prepared by the reaction of dinitrogen pentoxide {{chem|N|2|O|5}} with cobalt(III) fluoride {{chem|CoF|3}}. It can be purified by vacuum sublimation at 40 °C.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}}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}}
Cobalt(III) nitrate oxidizes water, the initial green solution rapidly turns pink, with formation of cobalt(II) ions and release of oxygen. Cobalt(III) nitrate can be intercalated in graphite, in the ratio of 1 molecule for each 12 carbon atoms.
See also
References
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{{Cobalt compounds}}
{{nitrates}}
Category:Cobalt(III) compounds
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