Arsenic pentafluoride

Arsenic pentafluoride
Structural formula	Ball-and-stick model
Names
	IUPAC name Arsenic pentafluoride
	Other names Arsenic(V) fluoride,; Arsorane, pentafluoro-
Identifiers
CAS Number	7784-36-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30530 ;
ChemSpider	74203 ;
ECHA InfoCard	100.029.146
PubChem CID	82223;
UNII	I54752Q0OJ ;
CompTox Dashboard (EPA)	DTXSID4064842 ;
	InChI InChI=1S/AsF5/c2-1(3,4,5)6 Key: YBGKQGSCGDNZIB-UHFFFAOYSA-N ; InChI=1/AsF5/c2-1(3,4,5)6 Key: YBGKQGSCGDNZIB-UHFFFAOYAA;
	SMILES F[As](F)(F)(F)F;
Properties
Chemical formula	AsF5
Molar mass	169.9136 g mol−1
Appearance	colorless gas
Density	2.138 kg/m3 (g/L)
Melting point	−79.8 ˚C
Boiling point	−52.8 ˚C
Solubility	Ethanol, Dimethylether, Benzene
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H280, H319, H350, H361, H370, H372
Precautionary statements	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)	4 0 1 W; OX
	NIOSH (US health exposure limits):
PEL (Permissible)	[1910.1018] TWA 0.010 mg/m3
REL (Recommended)	Ca C 0.002 mg/m3 [15-minute]
IDLH (Immediate danger)	Ca [5 mg/m3 (as As)]
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). verify (what is ?) Infobox references

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⁻

References

^ ^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.
^ ^a ^b ^c NIOSH Pocket Guide to Chemical Hazards. "#0038". National Institute for Occupational Safety and Health (NIOSH).
^ ^a ^b ^c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^ 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