Английская Википедия:Arsenic pentafluoride
Шаблон:Chembox 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:[1]
- 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.[1] In the solid state the axial As−F bond lengths are 171.9 pm and the equatorial 166.8 pm. [1] 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.[2]
- 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.Шаблон:Citation needed
See also
References
Шаблон:Arsenic compounds Шаблон:Fluorine compounds
- ↑ 1,0 1,1 1,2 Шаблон:Greenwood&Earnshaw
- ↑ 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), Шаблон:Doi
