Titanium Trifluoride, TiF₃

When titanium is dissolved in hydrofluoric acid the tetrafluoride alone results, but the Titanium Trifluoride, TiF₃, is formed as an insoluble violet powder when potassium titanifluoride, K₂TiF₆, is ignited in a current of hydrogen, or when the same substance is reduced in solution with zinc and hydrochloric acid, or by sodium amalgam. The complex salts (NH₄)₂TiF₅ and (NH₄)₃TiF₆ have been obtained; and the latter appears to be isomorphous with (NH₄)₃CrF₆, (NH₄)₃VF₆, and (NH₄),FeF₆.