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Names | |||
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IUPAC name
Sulfur hexafluoride
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Systematic IUPAC name
Hexafluoro-λ6-sulfane
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Other names
Elagas
Esaflon |
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Identifiers | |||
2551-62-4 | |||
3D model (Jmol) | Interactive image | ||
ChEBI | CHEBI:30496 | ||
ChemSpider | 16425 | ||
ECHA InfoCard | 100.018.050 | ||
EC Number | 219-854-2 | ||
2752 | |||
KEGG | D05962 | ||
MeSH | Sulfur+hexafluoride | ||
PubChem | 17358 | ||
RTECS number | WS4900000 | ||
UNII | WS7LR3I1D6 | ||
UN number | 1080 | ||
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Properties | |||
SF6 | |||
Molar mass | 146.06 g/mol | ||
Appearance | Colorless gas | ||
Odor | odorless | ||
Density | 6.17 g/L | ||
Melting point | −50.8 °C (−59.4 °F; 222.3 K) | ||
Boiling point | −64 °C; −83 °F; 209 K | ||
0.003% (25 °C) | |||
Solubility | slightly soluble in water, very soluble in ethanol, hexane, benzene | ||
Vapor pressure | 2.9 MPa (at 21.1 °C) | ||
−44.0·10−6 cm3/mol | |||
Structure | |||
Orthorhombic, oP28 | |||
Oh | |||
Orthogonal hexagonal | |||
Octahedral | |||
0 D | |||
Thermochemistry | |||
Std molar
entropy (S |
292 J·mol−1·K−1 | ||
Std enthalpy of
formation (ΔfH |
−1209 kJ·mol−1 | ||
Pharmacology | |||
V08DA05 (WHO) | |||
Hazards | |||
Safety data sheet | External MSDS | ||
S-phrases | S38 | ||
NFPA 704 | |||
US health exposure limits (NIOSH): | |||
PEL (Permissible)
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TWA 1000 ppm (6000 mg/m3) | ||
REL (Recommended)
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TWA 1000 ppm (6000 mg/m3) | ||
IDLH (Immediate danger)
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N.D. | ||
Related compounds | |||
Related sulfur fluorides
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Disulfur decafluoride |
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Related compounds
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Selenium hexafluoride |
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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 ?) | (|||
Infobox references | |||
Esaflon
Sulfur(VI) fluoride
Sulfuryl fluoride
Tellurium hexafluoride
Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless, non-flammable, extremely potent greenhouse gas, which is an excellent electrical insulator.SF
6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule. Typical for a nonpolar gas, it is poorly soluble in water but quite soluble in nonpolar organic solvents. It is generally transported as a liquefied compressed gas. It has a density of 6.12 g/L at sea level conditions, considerably higher than the density of air (1.225 g/L).
SF
6 can be prepared from the elements through exposure of S
8 to F
2. This was also the method used by the discoverers Henri Moissan and Paul Lebeau in 1901. Some other sulfur fluorides are cogenerated, but these are removed by heating the mixture to disproportionate any S
2F
10 (which is highly toxic) and then scrubbing the product with NaOH to destroy remaining SF
4.