Ammonium hexafluorotitanate

Ammonium hexafluorotitanate is the inorganic compound with the chemical formula ₂. 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:
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:

Structure

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