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]
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| Names | |
|---|---|
| IUPAC name Cobalt(III) nitrate | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.290.572 |
PubChem CID | |
CompTox Dashboard (EPA) | |
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| 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). | |
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]