Disulfur decafluoride
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| Names | |||
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Preferred IUPAC name
Disulfur decafluoride
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Systematic IUPAC name
Decafluoro-1λ6,2λ6-disulfane
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| Other names
sulfur pentafluoride
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| Identifiers | |||
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3D model (Jmol)
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| ChemSpider | |||
| ECHA InfoCard | 100.024.732 | ||
| EC Number | 227-204-4 | ||
| MeSH | Disulfur+decafluoride | ||
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PubChem CID
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| Properties | |||
| S2F10 | |||
| Molar mass | 254.1 g/mol | ||
| Appearance | colorless liquid | ||
| Odor | like sulfur dioxide | ||
| Density | 2.08 g/cm3 | ||
| Melting point | −53 °C (−63 °F; 220 K) | ||
| Boiling point | 30.1 °C (86.2 °F; 303.2 K) | ||
| insoluble | |||
| Vapor pressure | 561 mmHg (20 °C) | ||
| Hazards | |||
| Main hazards | Poisonous | ||
| NFPA 704 | |||
| Lethal dose or concentration (LD, LC): | |||
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LC50 (median concentration)
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2000 mg/m3 (rat, 10 min) 1000 mg/m3 (mouse, 10 min) 4000 mg/m3 (rabbit, 10 min) 4000 mg/m3 (guinea pig, 10 min) 4000 mg/m3 (dog, 10 min) |
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| US health exposure limits (NIOSH): | |||
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PEL (Permissible)
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TWA 0.025 ppm (0.25 mg/m3) | ||
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REL (Recommended)
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C 0.01 ppm (0.1 mg/m3) | ||
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IDLH (Immediate danger)
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1 ppm | ||
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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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| Infobox references | |||
Disulfur decafluoride (S2F10) is a gas discovered in 1934 by Denbigh and Whytlaw-Gray. Each S of the S2F10 molecule is octahedral, and surrounded by 5 fluorines. S2F10 is highly toxic, with toxicity 4 times that of phosgene. It was considered a potential chemical warfare pulmonary agent in World War II because it does not produce lacrimation or skin irritation, thus providing little warning of exposure. It is produced by the electrical decomposition of sulfur hexafluoride (SF6)—an essentially inert insulator used in high voltage systems such as transmission lines, substations and switchgear. S2F10 is also made during the production of SF6, but is distilled out.
Disulfur decafluoride is produced primarily by the decomposition of sulfur hexafluoride:
2 SF6 → S2F10 + F2
This compound contains sulfur in the sp3d2 hybridization where 2 sulfur atoms have zero polarization between them and 5 polarized connections with fluorine atoms.
At temperatures above 150 °C, S
2F
10 decomposes slowly to SF
6 and SF
4:
...
Wikipedia