Abstract
Aqueous solutions of titanium(IV) fluorides and fluorophosphates were studied by 19F and 31P NMR for variable F/Ti and (F + P)/Ti ratios. The species distribution is described as successive complexation equilibria. For the Ti/F binary system, equilibrium constants were determined for TiOF(H2O)4+, TiF5(H2O)-, and TiF62- and estimated for TiOF2(H2O)3, TiF3(OH)(H2O)2, and TiF4(H2O)2. Previously reported anionic species are confirmed and for the first time the spectral signatures of TiOF(H2O)4+, TiOF2(H2O)3, and TiF3(OH)(H2O)2 are provided. Fluorophosphates complexes were observed, and several species containing fluorides and phosphates were identified. These species are representatives of the primary building units during hydrothermal synthesis of nanoporous and mesoporous materials.
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