Ammonium hexafluoroaluminate

Ammonium hexafluoroaluminate is an inorganic compound with the chemical formula of (NH₄)₃[AlF₆]. It is a white solid. Upon heating, it converts to aluminium trifluoride, a reaction that releases hydrogen fluoride.^[1] It has also been used as a precursor to zeolites.^[2]

Ammonium hexafluoroaluminate

Names
Other names Ammonium aluminium fluoride
Identifiers
CAS Number	7784-19-2 Y
3D model (JSmol)	Interactive image
ChemSpider	11253835 Y
ECHA InfoCard	100.029.138
EC Number	264-415-0
PubChem CID	24565
UNII	SW274S3321 Y
CompTox Dashboard (EPA)	DTXSID401014476
InChI InChI=1S/Al.6FH.3H3N/h;6*1H;3*1H3/q+3;;;;;;;;;/p-3 Y Key: OYHBNKHFKHBTRQ-UHFFFAOYSA-K Y InChI=1/Al.6FH.3H3N/h;6*1H;3*1H3/q+3;;;;;;;;;/p-3/rAlF6.3H3N/c2-1(3,4,5,6)7;;;/h;3*1H3/q-3;;;/p+3 Key: OYHBNKHFKHBTRQ-IQDJHOCXAA
SMILES [NH4+].[NH4+].[NH4+].F[Al-3](F)(F)(F)(F)F
Properties
Chemical formula	(NH4)3[AlF6]
Molar mass	195.09 g/mol
Appearance	White crystalline powder
Density	1.78 g/cm3 at 20 °C
Melting point	126.1 °C (259.0 °F; 399.2 K)
Boiling point	239.5 °C (463.1 °F; 512.6 K)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Irritant (Xi)
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H311, H330, H331
Precautionary statements	P260, P261, P264, P270, P271, P280, P284, P301+P310, P302+P352, P304+P340, P310, P311, P312, P320, P321, P322, P330, P361, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)	2 0 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Preparation

Ammonium hexafluoroaluminate can be obtained by the reaction of ammonium fluoride and aluminium hydroxide.^[3]

6 NH₄F + Al(OH)₃ → (NH₄)₃[AlF₆] + 3 NH₄OH