Antimony trifluoride
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| Names | |||
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Preferred IUPAC name
Antimony(III) fluoride
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Systematic IUPAC name
Trifluorostibane
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| Other names
Trifluoroantimony
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| Identifiers | |||
7783-56-4 
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| 3D model (Jmol) | Interactive image | ||
| ChemSpider |
22960 
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| ECHA InfoCard | 100.029.099 | ||
| EC Number | 232-009-2 | ||
| PubChem | 24554 | ||
| RTECS number | CC5150000 | ||
| UN number | UN 2923 | ||
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| Properties | |||
| SbF3 | |||
| Molar mass | 178.76 g/mol | ||
| Appearance | light gray to white crystals | ||
| Odor | pungent | ||
| Density | 4.379 g/cm3 | ||
| Melting point | 292 °C (558 °F; 565 K) | ||
| Boiling point | 376 °C (709 °F; 649 K) | ||
| 385 g/100 mL (0 °C) 443 g/100 mL (20 °C) 562 g/100 mL (30 °C) |
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| Solubility | soluble in methanol, acetone insoluble in ammonia |
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| -46.0·10−6 cm3/mol | |||
| Structure | |||
| Orthorhombic, oS16 | |||
| Ama2, No. 40 | |||
| Hazards | |||
| NFPA 704 | |||
| Lethal dose or concentration (LD, LC): | |||
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LD50 (median dose)
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100 mg/kg | ||
| US health exposure limits (NIOSH): | |||
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PEL (Permissible)
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TWA 0.5 mg/m3 (as Sb) | ||
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REL (Recommended)
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TWA 0.5 mg/m3 (as Sb) | ||
| Related compounds | |||
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Related compounds
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antimony pentafluoride, antimony trichloride | ||
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is ?) |
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| Infobox references | |||
Antimony trifluoride is the inorganic compound with the formula SbF3. Sometimes called Swart's reagent, is one of two principal fluorides of antimony, the other being SbF5. It appears as a white solid. As well as some industrial applications, it is used as a reagent in inorganic and organofluorine chemistry.
In solid SbF3, the Sb centres have octahedral molecular geometry and are linked by bridging fluoride ligands. Three Sb–F bonds are short (192 pm) and three are long (261 pm). Because it is a polymer, SbF3 is far less volatile than related compounds AsF3 and SbCl3.
SbF3 is prepared by treating antimony trioxide with hydrogen fluoride:
The compound is a mild Lewis acid, hydrolyzing slowly in water. With fluorine, it is oxidized to give antimony pentafluoride.
It is used as a fluorination reagent in organic chemistry. This application was reported by the Belgium chemist Frédéric Jean Edmond Swarts in 1892, who demonstrated its usefulness for converting chloride compounds to fluorides. The method involved treatment with antimony trifluoride with chlorine or with antimony pentachloride to give the active species antimony trifluorodichloride (SbCl2F3). This compound can also be produced in bulk. The Swarts reaction is generally applied to the synthesis of organofluorine compounds, but experiments have been performed using silanes. It was once used for the industrial production of freon. Other fluorine-containing Lewis acids serve as fluorinating agents in conjunction with hydrogen fluoride.
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