Arsenic pentafluoride
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| Arsenic pentafluoride | |
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| IUPAC name | Arsenic(V) fluoride |
| Other names | Arsenic pentafluoride |
| Identifiers | |
| CAS number | [7784-36-3] |
| Properties | |
| Molecular formula | AsF5 |
| Molar mass | 169.91g mol-1 |
| Appearance | colorless gas |
| Density | 2.138 g cm-3[1] |
| Melting point |
-79.8 ˚C[1] |
| Boiling point |
-52.8 ˚C[1] |
| Solubility in water | N/A |
| Hazards | |
| Main hazards | Toxic, corrosive |
| R-phrases | R23/25, R50/53 |
| S-phrases | (S1/2), S20/21, S28, S45, S60, S61 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Arsenic pentafluoride is a chemical compound of arsenic and fluorine. The oxidation state of arsenic is +5.
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[edit] Synthesis
Arsenic pentafluoride can be prepared by direct combination of arsenic and fluorine[2]:
- 2As + 5F2 → 2AsF5
It can also be prepared by the reaction of arsenic trifluoride and fluorine:
- AsF3 + F2 → AsF5
[edit] Properties
Arsenic pentafluoride is a colourless gas and has a trigonal bipyramidal structure.[2] In the solid state the axial As-F bond lengths are 171.9 pm and the equatorial 166.8 pm.[2]
[edit] Reactions
Arsenic pentafluoride forms halide complexes and is a powerful acceptor as shown by the reaction with sulfur tetrafluoride forming an ionic complex.[3]
- AsF5 + SF4 → SF3+ + AsF6−
[edit] References
- ^ a b c Record of Arsenic(V) fluoride in the GESTIS Substance Database from the BGIA, accessed on 24/12/2007
- ^ a b c Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
- ^ An investigation of the structures of the adducts of SF4 with BF3, PF5, AsF5, and SbF5 in the solid state and in solution in HF, M. Azeem, M. Brownstein, and R. J. Gillespie Can. J. Chem. 47(22): 4159–4167 (1969), doi:10.1139/v69-689
