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Ammonium hexafluorotitanate
Chemical compound From Wikipedia, the free encyclopedia
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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.
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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
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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
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