Ammonium hexafluoroaluminate

Ammonium hexafluoroaluminate
Names
	Other names Ammonium aluminium fluoride
Identifiers
CAS Number	7784-19-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	11253835 ;
ECHA InfoCard	100.029.138
EC Number	264-415-0;
PubChem CID	24565;
UNII	SW274S3321 ;
CompTox Dashboard (EPA)	DTXSID401014476 ;
	InChI InChI=1S/Al.6FH.3H3N/h;61H;31H3/q+3;;;;;;;;;/p-3 Key: OYHBNKHFKHBTRQ-UHFFFAOYSA-K ; InChI=1/Al.6FH.3H3N/h;61H;31H3/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). verify (what is ?) Infobox references

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]

Preparation

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

\mathrm {6\ NH_{4}F+Al(OH)_{3}\longrightarrow (NH_{4})_{3}[AlF_{6}]+3\ NH_{4}OH}

^ Alonso, C.; Morato, A.; Medina, F.; Guirado, F.; Cesteros, Y.; Salagre, P.; Sueiras, J. E.; Terrado, R.; Giralt, A. (2000). "Preparation and Characterization of Different Phases of Aluminum Trifluoride". Chemistry of Materials. 12 (4): 1148–1155. doi:10.1021/cm991195g.
^ Kao, Hsien-Ming; Ting, Chun-Chiang; Chao, Shih-Wei (2005). "Post-synthesis alumination of mesoporous silica SBA-15 with high framework aluminum content using ammonium hexafluoroaluminate". Journal of Molecular Catalysis A: Chemical. 235 (1–2): 200–208. doi:10.1016/j.molcata.2005.03.026.
^ hrsg. von Georg Brauer. Unter Mitarb. von M. Baudler (1975). Handbuch der präparativen anorganischen Chemie / 1 (in German). Stuttgart: Enke. p. 239. ISBN 3-432-02328-6. OCLC 310719485.

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