|UN number||UN 2923|
|Jmol-3D images||Image 1|
|Molar mass||178.76 g/mol|
|Appearance||light gray to white crystals|
|Melting point||292 °C (558 °F; 565 K)|
|Boiling point||376 °C (709 °F; 649 K)|
|Solubility in water||385 g/100 mL (0 °C)
443 g/100 mL (20 °C)
562 g/100 mL (30 °C)
|Solubility||soluble in methanol, acetone
insoluble in ammonia
|Crystal structure||Orthorhombic, oS16|
|Space group||Ama2, No. 40|
|Related compounds||antimony pentafluoride, antimony trichloride|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
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.
Preparation and structure
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.
- Sb2O3 + 6 HF → 2 SbF3 + 3 H2O
- SbF3 + F2 → SbF5
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.
SbF3 is used in dyeing and in pottery, to make ceramic enamels and glazes.
The lethal minimum dose (guinea pig, oral) is 100 mg/kg.
- Sabina C. Grund, Kunibert Hanusch, Hans J. Breunig, Hans Uwe Wolf "Antimony and Antimony Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2006, Wiley-VCH, Weinheim. doi:10.1002/14356007.a03_055.pub2
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.
- Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 199.
- Tariq Mahmood and Charles B. Lindahl Fluorine Compounds, Inorganic, Antimony in Kirk‑Othmer Encyclopedia of Chemical Technology.doi:10.1002/0471238961.0114200913010813.a01
- Swarts (1892). Acad. Roy. Belg 3 (24): 474.
- US 4438088
- Booth, Harold Simmons; Suttle, John Francis (1946). "IV. The Preparation and Fluorination of Dimethyl and Trimethyl Chlorosilanes". J. Ac. Chem. Soc 68 (12): 2658–2660. doi:10.1021/ja01216a072.
- Sabina C. Grund, Kunibert Hanusch, Hans J. Breunig, Hans Uwe Wolf “Antimony and Antimony Compounds” in Ullmann's Encyclopedia of Industrial Chemistry 2006, Wiley-VCH, Weinheim. doi: 10.1002/14356007.a03_055.pub2