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Arsenic pentafluoride

Arsorane, pentafluoro- | NFPA-H = 4 | NFPA-F = 0 | NFPA-R = 1 | NFPA-S = W+OX Arsenic trifluoride Arsenic pentoxide Antimony pentafluoride Bismuth pentafluoride 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:

: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. In the solid state the axial As−F bond lengths are 171.9 pm and the equatorial 166.8 pm. 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.

:AsF5 + SF4 → SF3+ + AsF6−

References

References

  1. {{GESTIS
  2. {{PGCH. 0038
  3. {{Greenwood&Earnshaw
  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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arsenic(v)-compounds fluorides arsenic-halides
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