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.