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Arsenic pentafluoride

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Arsenic pentafluoride is a chemical compound of arsenic and fluorine. It is a toxic, colorless gas. The oxidation state of arsenic is +5.

Arsenic pentafluoride
Structural formula
Structural formula
Ball-and-stick model
Ball-and-stick model
Names
IUPAC name
Arsenic pentafluoride
Other names
Arsenic(V) fluoride,
Arsorane, pentafluoro-
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.029.146 Edit this at Wikidata
UNII
  • InChI=1S/AsF5/c2-1(3,4,5)6 checkY
    Key: YBGKQGSCGDNZIB-UHFFFAOYSA-N checkY
  • InChI=1/AsF5/c2-1(3,4,5)6
    Key: YBGKQGSCGDNZIB-UHFFFAOYAA
  • F[As](F)(F)(F)F
Properties
AsF5
Molar mass 169.9136 g mol−1
Appearance colorless gas
Density 2.138 kg/m3 (g/L)[1]
Melting point −79.8 ˚C[1]
Boiling point −52.8 ˚C[1]
Solubility Ethanol, Dimethylether, Benzene
Hazards
GHS labelling:
GHS07: Exclamation markGHS08: Health hazard
Danger
H319, H350, H361, H370, H372
P201, P202, P260, P264, P270, P280, P281, P305+P351+P338, P307+P311, P308+P313, P314, P321, P337+P313, P405, P410+P403, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazard W+OX: Reacts with water in an unusual or dangerous manner AND is oxidizer
4
0
1
W
OX
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]
Related compounds
Related group 5 fluorides
 Phosphorus pentafluoride
Antimony pentafluoride
Bismuth pentafluoride
Related compounds
 Arsenic pentachloride
Arsenic trifluoride
Arsenic pentoxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis

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Arsenic pentafluoride can be prepared by direct combination of arsenic and fluorine:[3]

2As + 5F2 → 2AsF5

It can also be prepared by the reaction of arsenic trifluoride and fluorine:

AsF3 + F2 → AsF5

or the addition of fluorine to arsenic pentoxide or arsenic trioxide.

2As2O5 + 10F2 → 4AsF5 + 5O2
2As2O3 + 10F2 → 4AsF5 + 3O2

Properties

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Arsenic pentafluoride is a colourless gas and has a trigonal bipyramidal structure.[3] In the solid state the axial As−F bond lengths are 171.9 pm and the equatorial 166.8 pm. [3] Its point group is D3h.

Reactions

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Arsenic pentafluoride forms halide complexes and is a powerful fluoride acceptor. An example is the reaction with sulfur tetrafluoride, forming an ionic hexafluoroarsenate complex.[4]

AsF5 + SF4 → SF3+ + AsF6−

See also

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References

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  1. ^ a b c Record of Arsenic(V) fluoride in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 24/12/2007.
  2. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0038". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  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
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