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Ammonium hexafluoroindate is an inorganic chemical compound with the chemical formula (NH₄)₃InF₆.

Synthesis

The compound can be obtained by reacting ammonium fluoride and indium bromide in anhydrous methanol, or by reacting ammonium fluoride and indium fluoride in aqueous solution.

Also, a reaction involving indium hydroxide and ammonium fluoride:

In(OH)₃ + 3 HF + 3 NH₄F → (NH₄)₃InF₆ + 3 H₂O

Physical properties

The compound decomposes at 120–170 °C to obtain NH₄InF₄, and further decomposes to InF₃ at 185–300 °C.

Ammonium hexafluoroindiate forms colorless crystals of tetragonal system, space group P4mnc, insoluble in water.

At 80 °C, a phase transition into the cubic phase occurs.

References

1. Roberts, John E.; Laubengayer, A. W. (November 1957). "Fluoride Complexes of Indium(III) 1". Journal of the American Chemical Society. 79 (22): 5895–5897. doi:10.1021/ja01579a016. ISSN 0002-7863. Retrieved 30 August 2024.
2. "Ammonium hexafluoroindate(iii)". NIST. Retrieved 30 August 2024.
3. Zakalyukin, R. M.; Boltalin, A. I.; Fedorov, P. P. (2001). "Synthesis of ammonium hexafluoroindate". Zhurnal Neorganicheskoi Khimii. 8 (46): 1247–1249. ISSN 0044-457X. Retrieved 30 August 2024.
4. ^ Brauer, Georg (2 December 2012). Handbook of Preparative Inorganic Chemistry V1. Elsevier. p. 229. ISBN 978-0-323-16127-5. Retrieved 30 August 2024.
5. Beck, Lynda K.; Haendler Kugler, Blanca; Haendler, Helmut M. (December 1973). "The thermal decomposition of ammonium hexafluorogallate and ammonium hexafluoroindate. New crystalline forms of gallium fluoride and indium fluoride". Journal of Solid State Chemistry. 8 (4): 312–317. Bibcode:1973JSSCh...8..312B. doi:10.1016/S0022-4596(73)80027-1. S2CID 95324633.
6. Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. 108. Retrieved 30 August 2024.

• Fluoro complexes
• Ammonium compounds
• Fluorometallates
• Hexafluorides