Ammonium hexafluoroaluminate explained

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]

6 NH _{4F} +Al(OH) _{3} \longrightarrow(NH _{4)} _{3[AlF} _{6]} +3 NH _{4OH}

References

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