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Ammonium hexafluoroarsenate

Identifiers
3D model (JSmol)	Interactive image
PubChem CID	14205731
InChI InChI=1S/AsF6.H3N/c2-1(3,4,5,6)7;/h;1H3/q-1;/p+1Key: CXAUDRIMGKYIRL-UHFFFAOYSA-O
SMILES .F(F)(F)(F)(F)F
Properties
Chemical formula	AsF6H4N
Molar mass	206.951 g·mol
Appearance	colourless crystals
Density	2.769 g/cm
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Ammonium hexafluoroarsenate is an inorganic chemical compound with the chemical formula NH₄AsF₆.

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:

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 Å, space group R3 (No. 148).

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.

• Fluoro complexes
• Arsenates
• Ammonium compounds
• Fluorometallates
• Hexafluorides