Aqueous Chemistry of Titanium(II) Species

摘要

Reports on titanium in the oxidation state +II are confined to solid-state compounds, such as the nonstoichiometric oxide TiO_x, the hydride TiH_2 as well as halides TiF_2 and TiCl_2 and a number of coordination compounds [TiCl_2L_n]. Although a calculated redox potential of E°(Ti~(III)/Ti~(II)) = -0.37 V versus the normal hydrogen electrode (NHE) appears in textbooks and tables, which suggests the existence of the Ti_(aq)~(II) ion, the aqueous chemistry of Ti~(II) is almost unknown.