Ammonium hexafluoroarsenate

Ammonium hexafluoroarsenate
Identifiers
3D model (JSmol)
  • InChI=1S/AsF6.H3N/c2-1(3,4,5,6)7;/h;1H3/q-1;/p+1
    Key: CXAUDRIMGKYIRL-UHFFFAOYSA-O
  • [NH4+].F[As-](F)(F)(F)(F)F
Properties
AsF6H4N
Molar mass 206.951 g·mol−1
Appearance colourless crystals
Density 2.769 g/cm3
Hazards
GHS labelling:[citation needed]
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Ammonium hexafluoroarsenate is an inorganic chemical compound with the chemical formula NH4AsF6.[1][2]

Synthesis

Arsenic pentoxide is mixed with an excess of ammonium fluoride; the mixture is fused to produce ammonium hexafluoroarsenate:

AsF5 + NH4F → NH4AsF6

Also, reaction of arsenic trifluoride, hydrofluoric acid, and ammonia:[dubious – discuss]

AsF3 + HF + NH4 → NH4AsF6

Treatment of hexafluoroarsenic acid and ammonia:

HAsF6 + NH3 → NH4AsF6

Physical properties

Ammonium hexafluoroarsenate crystallizes rhombohedral with the KOsF6 structure type, with parameters: a = 7.459(3) Å, c = 7.543(3) Å (at 200 K), Z = 3, unit cell volume 363.4 Å3, space group R3 (No. 148).[3]

References

  1. ^ Desmarteau, Darryl D.; Lam, William Y.; O'Brien, Brian A.; Chang, Shi-Ching (1 July 1984). "Novel ammonium hexafluoroarsenate salts from reaction of (CF3)2NH, CF3N(OCF3)H, CF3N[OCF(CF3)2]H, CF3NHF and SF5NHF with the strong acid HF/ASF5". Journal of Fluorine Chemistry. 25 (3): 387–394. doi:10.1016/S0022-1139(00)81212-9. ISSN 0022-1139. Retrieved 4 September 2024.
  2. ^ Yaws, Carl L. (6 January 2015). The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals: Physical Properties for More Than 54,000 Organic and Inorganic Chemical Compounds, Coverage for C1 to C100 Organics and Ac to Zr Inorganics. Gulf Professional Publishing. p. 731. ISBN 978-0-12-801146-1. Retrieved 4 September 2024.
  3. ^ Goreshnik, E.; Mazej, Z. (July 2007). "X–ray Single Crystal Structure and Raman Spectrum of Ammonium Hexafluoroarsenate". Zeitschrift für anorganische und allgemeine Chemie. 633 (8): 1271–1273. doi:10.1002/zaac.200700043. ISSN 0044-2313. Retrieved 4 September 2024.