Other grades of this product :
| Product Name: | Cobalt(II) fluoride | | Synonyms: | cobaltfluoride(cof2);Cobaltousfluoride,dihydrate;COBALTOUS FLUORIDE;COBALT DIFLUORIDE;COBALT FLUORIDE;COBALT FLUORIDE PINK;COBALT(II) FLUORIDE;Cobalt(Ⅱ)fluoride | | CAS: | 10026-17-2 | | MF: | CoF2 | | MW: | 96.93 | | EINECS: | 233-061-9 | | Product Categories: | metal halide | | Mol File: | 10026-17-2.mol |
| Cobalt(II) fluoride Chemical Properties |
| Melting point | 1200 °C | | Boiling point | 1400 °C | | density | 4.46 g/mL at 25 °C | | form | powder | | color | Pink | | Specific Gravity | 4.46 | | Water Solubility | Soluble in water, alcohol and acetone. | | Sensitive | Hygroscopic | | Merck | 14,2440 | | Exposure limits | ACGIH: TWA 0.02 mg/m3; TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 | | Stability: | hygroscopic | | CAS DataBase Reference | 10026-17-2(CAS DataBase Reference) | | EPA Substance Registry System | Cobalt fluoride (CoF2) (10026-17-2) |
| Cobalt(II) fluoride Usage And Synthesis |
| Preparation | Cobalt(II) fluoride is prepared by heating anhydrous cobalt(II) chloride or oxide in a stream of hydrogen fluoride:
CoCl2 + 2HF → CoF2 + 2HCl
CoO + 2HF → CoF2 + 2H2O
Also, cobalt(II) fluoride can be prepared as a tetrahydrate, CoF2•4H2O by dissolving cobalt(II) hydroxide in hydrofluoric acid. The tetrahydrate is then dehydrated to anhydrous fluoride. Elemental fluorine combines with cobalt at 450°C forming mixtures of cobalt(II)–and cobalt(III) fluorides.
| | Chemical Properties | Rose-red crystals or powder. Soluble in cold
water and hydrofluoric acid. Decomposes in hot
water. Ammine complexes can be prepared from
the hydrate. | | Physical properties | Red tetragonal crystal; density 4.46 g/cm3; melts at 1,127°C; vaporizes around 1,400°C; sparingly soluble in water; soluble in warm mineral acids; decomposes in boiling water. Tetrahydrate is red orthogonal crystal; density 2.22 g/cm3; decomposes on heating; soluble in water; di- and trihydrates are soluble in water. | | Uses | Cobalt(II) fluoride can be used as a catalyst to alloy metals. It is also used for optical deposition, of which it tremendously improves optical quality. The compound may be used in dental care. | | Uses | Catalyst for organic reactions. | | General Description | Violet to red solid. Sinks and mixes slowly with water. | | Reactivity Profile | Cobalt(II) fluoride is a toxic, light brown crystalline material, when exposed to water Cobalt(II) fluoride forms highly corrosive hydrofluoric acid. When heated to decomposition Cobalt(II) fluoride emits toxic fumes of metallic cobalt and fluorides [Lewis, 3rd ed., 1993, p. 344]. | | Hazard | Highly toxic. | | Health Hazard | INHALATION: Inhalation of dust may cause pulmonary symptoms. EYES: Irritation. SKIN: Skin rashes, dermatitis. INGESTION: Nausea and vomiting caused by local irritation.
LD50 oral (rat): 150 mg/kg
| | Safety Profile | Poison by ingestion.
When heated to decomposition it emits
toxic fumes of Co and F-. |
| Cobalt(II) fluoride Preparation Products And Raw materials |
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