Hexafluorotitanic acid

Hexafluorotitanic acid
Names
	IUPAC name Hexafluorotitanic acid
Identifiers
CAS Number	anhydrous: 17439-11-1 [ECHA];
3D model (JSmol)	anhydrous: Interactive image;
ChemSpider	anhydrous: 19989125;
ECHA InfoCard	100.037.676
EC Number	anhydrous: 241-460-4;
PubChem CID	anhydrous: 161221;
CompTox Dashboard (EPA)	anhydrous: DTXSID70893446 ;
	InChI Key: PFSXARRIPPWGNC-UHFFFAOYSA-J; anhydrous: InChI=1/6FH.Ti/h61H;/q;;;;;;+4/p-4/f6F.Ti.2H/h61h;;;/q6-1;m;2+1;
	SMILES anhydrous: [H+].[H+].F[Ti-2](F)(F)(F)(F)F;
Properties
Chemical formula	F6H8O3Ti
Molar mass	217.918 g·mol−1
Appearance	colorless solid
Density	2.10 g/cm3
Related compounds
Other anions	Hexafluorosilicic acid; Ammonium hexafluorotitanate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Hexafluorotitanic acid (systematically named oxonium hexafluoridotitanate(2-)) is an inorganic compound with the chemical formula (H₃O)(H₅O₂)[TiF₆]. According to X-ray crystallography, the salt consists of [TiF₆]^2- octahedral and two kinds of oxonium cations, (H₃O)⁺ and (H₅O₂)⁺.^[1]

As with most oxonium salts, it is only stable in acidic solution. Under basic conditions, closely related salts hydrolyse to a hydrated titanium dioxide:^[2]

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

A related salt is the anhydrous fluoronium hexafluoridotitanate(2-) or (H₂F)₂[TiF₆].

References

^ Mootz, D.; Oellers, E.-J.; Wiebcke, M. (1988). "Hexafluorotitan(IV)-Saure: Untersuchungen zur Bildung und Struktur kristalliner Hydrate". Zeitschrift für Anorganische und Allgemeine Chemie. 564: 17–25. doi:10.1002/zaac.19885640103.
^ 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.

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[1] Mootz, D.; Oellers, E.-J.; Wiebcke, M. (1988). "Hexafluorotitan(IV)-Saure: Untersuchungen zur Bildung und Struktur kristalliner Hydrate". Zeitschrift für Anorganische und Allgemeine Chemie. 564: 17–25. doi:10.1002/zaac.19885640103.

[2] 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.

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