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Hexafluorotitanic acid

Names
IUPAC name Hexafluorotitanic acid
Identifiers
CAS Number	anhydrous: 17439-11-1
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/h6*1H;/q;;;;;;+4/p-4/f6F.Ti.2H/h6*1h;;;/q6*-1;m;2*+1
SMILES anhydrous: ..F(F)(F)(F)(F)F
Properties
Chemical formula	F6H8O3Ti
Molar mass	217.918 g·mol
Appearance	colorless solid
Density	2.10 g/cm
Related compounds
Other anions	Hexafluorosilicic acid Ammonium hexafluorotitanate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

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

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

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

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

References

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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