Cobalt(III) chloride
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Cobalt(III) chloride or cobaltic chloride is an unstable and elusive compound of cobalt and chlorine with formula CoCl
3. In this compound, the cobalt atoms have a formal charge of +3.[1]
| Names | |
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| IUPAC name
Cobalt(III) chloride | |
| Other names
Cobaltic chloride Cobalt trichloride | |
| Identifiers | |
3D model (JSmol) |
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| ECHA InfoCard | 100.030.509  |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| CoCl3 | |
| Molar mass | 165.2913 g/mol (anhydrous) |
| Melting point | Solid decomposes over −60°C |
| Solubility | soluble in ethanol, diethyl ether |
| Hazards | |
| GHS labelling: | |
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| Danger | |
| H300, H330 | |
| P260, P264, P270, P271, P284, P301+P310, P304+P340, P310, P320, P321, P330, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The compound has been reported to exist in the gas phase at high temperatures, in equilibrium with cobalt(II) chloride and chlorine gas.[2][3] It has also been found to be stable at very low temperatures, dispersed in a frozen argon matrix.[4]
Some articles from the 1920s and 1930s claim the synthesis of bulk amounts of this compound in pure form;[5][6] however, those results do not seem to have been reproduced, or have been attributed to other substances like the hexachlorocobaltate(III) anion CoCl3−
6.[1] Those earlier reports claim that it gives green solutions in anhydrous solvents such as ethanol and diethyl ether, and that it is stable only a very low temperatures (below −60 °C).[7]