Aqueous Chemistry of Titanium(<scp>II</scp>) Species

Abstract

Wetting the appetite for TiII chemistry: Titanium metal is dissolved by aqueous acids in the presence of fluoride ions. The resulting green solution does not contain TiIII but a mixture of TiII and TiIV complexes. The presence of a d2 TiII species is confirmed by UV/Vis spectroscopy. A mixed-valent solid, TiII(TiIVF6)(H2O)4, can be isolated from the solution and its structure parameters determined by powder diffraction (see picture, TiIV red, TiII blue).