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| Names | |||
|---|---|---|---|
| IUPAC name Arsenic(III) fluoride | |||
| Other names Arsenic trifluoride, trifluoroarsane, TL-156 | |||
| Identifiers | |||
3D model (JSmol) | |||
| ChemSpider |
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| ECHA InfoCard | 100.029.145 | ||
| EC Number |
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| RTECS number |
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| UNII | |||
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| Properties | |||
| AsF3 | |||
| Molar mass | 131.9168 g/mol | ||
| Appearance | colorless oily liquid | ||
| Density | 2.666 g/cm3 (0 °C)[1] | ||
| Melting point | −8.5 °C (16.7 °F; 264.6 K) | ||
| Boiling point | 60.4 °C (140.7 °F; 333.5 K) | ||
| decomposes | |||
| Solubility | soluble inalcohol,ether,benzene andammonia solution | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards | Toxic, corrosive | ||
| GHS labelling: | |||
 | |||
| Danger | |||
| H301,H311,H331 | |||
| P261,P264,P270,P271,P280,P301+P310,P302+P352,P304+P340,P311,P312,P321,P322,P330,P361,P363,P403+P233,P405,P501 | |||
| NIOSH (US health exposure limits): | |||
PEL (Permissible) | [1910.1018] TWA 0.010 mg/m3[2] | ||
REL (Recommended) | Ca C 0.002 mg/m3 [15-minute][2] | ||
IDLH (Immediate danger) | Ca [5 mg/m3 (as As)][2] | ||
| Thermochemistry | |||
Std enthalpy of formation(ΔfH⦵298) | −821.3 kJ/mol | ||
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |||
Arsenic trifluoride is achemical compound ofarsenic andfluorine with the chemical formula AsF3. It is a colorless liquid which reacts readily with water.[3] Like other inorganic arsenic compounds, it ishighly toxic.
It can be prepared by treatingarsenic trioxide withhydrogen fluoride:[4]
It has a pyramidal molecular structure in the gas phase which is also present in the solid.[3] In the gas phase the As-F bond length is 170.6 pm and the F-As-F bond angle 96.2°.[5]
Arsenic trifluoride is used as a fluorinating agent for the conversion of non-metal chlorides to fluorides, in this respect it is less reactive than SbF3.[3]
Salts containing AsF4− anion can be prepared for example CsAsF4.[6] the potassium salt KAs2F7 prepared from KF and AsF3 contains AsF4− and AsF3 molecules with evidence of interaction between the AsF3 molecule and the anion.[7]
AsF3 reacts withSbF5. The product obtained could be described as the ionic compound AsF2+ SbF6−. However, the authors conclude the formed product cannot be viewed only as an ionic compound nor entirely as the neutral adduct AsF3SbF5. The crystal structure displays characteristics of both an ionic pair, and a neutral adduct, taking the middle ground in between both models.[8]
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