Silicon tetrafluoride
Silicon tetrafluoride or tetrafluorosilane is a chemical compound with the formula SiF4. This colorless gas is notable for having a narrow liquid range: its boiling point is only 4 °C above its melting point. It was first prepared in 1771 by Carl Wilhelm Scheele by dissolving silica in hydrofluoric acid., later synthesized by John Davy in 1812. It is a tetrahedral molecule and is corrosive.
| Names | |
|---|---|
| IUPAC names
Tetrafluorosilane Silicon tetrafluoride | |
| Other names
Silicon fluoride Fluoro acid air | |
| Identifiers | |
3D model (JSmol) |
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| ECHA InfoCard | 100.029.104 |
PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 1859 |
CompTox Dashboard (EPA) |
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| Properties | |
| SiF4 | |
| Molar mass | 104.0791 g/mol |
| Appearance | colourless gas, fumes in moist air |
| Density | 1.66 g/cm3, solid (−95 °C) 4.69 g/L (gas) |
| Melting point | −95.0 °C (−139.0 °F; 178.2 K) |
| Boiling point | −90.3 °C (−130.5 °F; 182.8 K) |
| decomposes | |
| Structure | |
| tetrahedral | |
| 0 D | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
toxic, corrosive |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LCLo (lowest published) |
69.220 mg/m3 (rat, 4 hr) |
| Safety data sheet (SDS) | ICSC 0576 |
| Related compounds | |
Other anions |
Silicon tetrachloride Silicon tetrabromide Silicon tetraiodide |
Other cations |
Carbon tetrafluoride Germanium tetrafluoride Tin tetrafluoride Lead tetrafluoride |
Related compounds |
Hexafluorosilicic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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