| | COBALT(III) FLUORIDE Basic information |
| | COBALT(III) FLUORIDE Chemical Properties |
| Melting point | 927°C | | density | 3.88 g/mL at 25 °C(lit.) | | form | Powder | | color | Light brown | | Specific Gravity | 3.88 | | Water Solubility | Insoluble in water. | | Sensitive | Hygroscopic | | Merck | 14,2430 | | Exposure limits | ACGIH: TWA 0.02 mg/m3; TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 | | Stability: | hygroscopic | | CAS DataBase Reference | 10026-18-3(CAS DataBase Reference) | | EPA Substance Registry System | Cobalt fluoride (CoF3) (10026-18-3) |
| Hazard Codes | C,T,O | | Risk Statements | 34 | | Safety Statements | 26-36/37/39-45 | | RIDADR | UN 3260 8/PG 2 | | WGK Germany | 3 | | F | 21 | | Hazard Note | Toxic/Corrosive/Oxidiser | | TSCA | Yes | | HazardClass | 5.1 | | PackingGroup | III | | HS Code | 28261990 |
| | COBALT(III) FLUORIDE Usage And Synthesis |
| Chemical Properties | brown powder | | Chemical Properties | The heat of formation is —187 kcal mole-1 and the magnetic moment is 1-60
B.M. at 90°K rising to 2.46 B.M. at 293°K; it is thus a high spin compound but not magnetically dilute.
Anhydrous cobalt(III) fluoride turns dark in the presence of traces of water and reacts violently with the liquid-evolving oxygen. When heated in an inert atmosphere above 350°, cobalt(II) fluoride is formed. It reacts vigorously with many elements, e.g. Al, P, As, S, I, being reduced to cobalt(II) fluoride. It is insoluble in alcohol, ether and benzene and is a useful fluorinating agent in organic chemistry. | | Physical properties | Light brown hexagonal crystal; density 3.88 g/cm3; moisture sensitive; stable in dry air; melts at 927°C; reacts with water. | | Uses | Important fluorinating agent, particularly for complete fluorination of hydrocarbons by the Fowler process. | | Uses | Cobalt(III) fluoride is a powerful fluorinating agent. | | Preparation | Cobalt(III) fluoride may be prepared by reaction of elemental fluorine with cobalt(II) fluoride, cobalt(II) chloride or cobalt(III) oxide at 300 to 400°C.
2CoF2 + F2 → 2CoF3
2CoCl2 + 3F2 → 2CoF3 + 2Cl2
It should be stored in a sealed glass ampule, free from moisture.
Electrolytic oxidation of cobalt(II) fluoride in 40% hydrofluoric acid yields hydrated cobalt(III) fluoride, CoF3·3.5H2O (3.5 is the stoichiometric amount of water per CoF3 molecule in the crystal lattice).
| | Hazard | Strong irritant to tissue. | | Structure and conformation | It forms hexagonal crystals of density 3.89, isomorphous with iron(III) and
aluminium(III) fluorides, the cobalt atoms being octahedraily surrounded by fluorine atoms. |
| | COBALT(III) FLUORIDE Preparation Products And Raw materials |
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