Arsenic pentafluoride

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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
Dimethylether, Benzene
Hazards
GHS labelling:
GHS04: Compressed GasGHS07: Exclamation markGHS08: Health hazard
Danger
H280, 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).
checkY verify (what is checkY☒N ?)

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

Synthesis

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

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

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−

Safety

Arsenic pentafluoride is an extremely dangerous toxin, mainly poisoning liver cells. It has a smell that is similar to vinyl chloride gas.[citation needed]

See also

References

  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. ^
    ISBN 978-0-08-037941-8
    .
  4. doi:10.1139/v69-689
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