Cobalt(II) fluoride
Chemical compound
From Wikipedia, the free encyclopedia
Cobalt(II) fluoride is an inorganic compound with the formula CoF2. It is a pink paramagnetic solid.[2] Like some other metal difluorides, CoF2 crystallizes in the rutile structure, which features octahedral Co centers and planar fluorides.[3]
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| Names | |
|---|---|
| IUPAC name
Cobalt(II) fluoride | |
| Other names
cobalt difluoride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.030.044 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| CoF2 | |
| Molar mass | 96.93 g/mol |
| Appearance | Red crystalline solid |
| Density | 4.46 g/cm3 (anhydrous) 2.22 g/cm3 (tetrahydrate) |
| Melting point | 1,217 °C (2,223 °F; 1,490 K) |
| Boiling point | 1,400 °C (2,550 °F; 1,670 K) |
| 1.4 g/100 mL (25 °C) | |
| Solubility | soluble in HF insoluble in alcohol, ether, benzene |
| +9490.0·10−6 cm3/mol | |
| Structure | |
| tetragonal (anhydrous) orthorhombic (tetrahydrate) | |
| Hazards | |
| GHS labelling:[1] | |
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| Danger | |
| H301, H314, H317, H351 | |
| P203, P260, P264, P270, P272, P280, P301+P316, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P318, P321, P330, P333+P317, P362+P364, P363, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
oral (rat): 150 mg/kg |
| Related compounds | |
Other anions |
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Other cations |
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Related compounds |
Cobalt trifluoride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
Treating anhydrous cobalt chloride with hydrogen fluoride gives cobalt(II) fluoride:[4]
- CoCl2 + 2 HF → CoF2 + 2 HCl
Tetrahydrated cobalt(II) fluoride is formed by dissolving cobalt(II) in hydrofluoric acid. The anhydrous fluoride can be extracted from this by dehydration. Other synthesis can occur at higher temperatures.[5]
Reactions
Cobalt(II) fluoride reacts with fluorine to give cobalt(III) fluoride:
- CoF2 + 0.5 F2 → CoF3
The latter is a catalyst for fluorination reactions.
