Ammonium hexafluorotitanate

Ammonium hexafluorotitanate
Identifiers
CAS Number	16962-40-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	9496500;
ECHA InfoCard	100.037.291
EC Number	241-036-9;
PubChem CID	11321546;
CompTox Dashboard (EPA)	DTXSID30937653 ;
	InChI InChI=1S/6FH.2H3N.Ti/h61H;21H3;/q;;;;;;;;+4/p-4 Key: NMGYKLMMQCTUGI-UHFFFAOYSA-J;
	SMILES [NH4+].[NH4+].F[Ti-2](F)(F)(F)(F)F;
Properties
Chemical formula	F6H8N2Ti
Molar mass	197.935 g·mol−1
Appearance	white solid
Density	1.675g/cm3
Related compounds
Other anions	Hexafluorosilicate; Hexafluorotitanic acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ammonium hexafluorotitanate is the inorganic compound with the chemical formula (NH₄)₂[TiF₆]. A colorless salt, the compound consists of ammonium ions and the hexafluorotitanate dianion.

Synthesis

The compound is encountered in the extraction of titanium from its principal ore ilmenite: the ore is treated with excess ammonium fluoride:^[1]

FeTiO₃ + 10 NH₄F → (NH₄)₂FeF₄ + (NH₄)₂TiF₆ + 6 H₂O

After removal of iron impurities, the titanium is recovered as a hydrated titanium dioxide by treatment of the aqueous extract of the hexafluoride with ammonia:

(NH₄)₂TiF₆ + 4 NH₃ + 2 H₂O → TiO₂ + 6 NH₄F

Structure

Many salts of hexafluorotitanate have been characterized by X-ray crystallography. In the lattice [TiF₆]^2- octahedra interact with the ammonium cations by hydrogen bonds.^[2]

References

^ Bichowsky, Foord Von (1957). "Extraction of Titanium(IV) Oxide from Ilmenite". Inorganic Syntheses. Vol. V. pp. 79–82. doi:10.1002/9780470132364.ch22. ISBN 9780470132364.
^ Tun, Z.; Brown, I. D. (1982). "Hydrogen bonding in Diammonium Hexafluorotitanate". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 38 (6): 1792–1794. Bibcode:1982AcCrB..38.1792T. doi:10.1107/S0567740882007195.

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[1] Bichowsky, Foord Von (1957). "Extraction of Titanium(IV) Oxide from Ilmenite". Inorganic Syntheses. Vol. V. pp. 79–82. doi:10.1002/9780470132364.ch22. ISBN 9780470132364.

[2] Tun, Z.; Brown, I. D. (1982). "Hydrogen bonding in Diammonium Hexafluorotitanate". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 38 (6): 1792–1794. Bibcode:1982AcCrB..38.1792T. doi:10.1107/S0567740882007195.

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