A solution chemistry study of nonhydrolytic sol-gel routes to titania

摘要

The etherolysis/condensation of TiCl_4 by diisopropyl ether (~iPr_2O) as well as the direct condensation between TiCl_4 and Ti(O~iPr)_4 are efficient nonhydrolytic sol-gel routes to titania. A comparison of the solution chemistry of the two routes was performed by means of NMR spectroscopy. In both cases the condensation is slow at room temperature; the true precursors are titanium chloroisopropoxides in equilibrium through fast ligand-exchange reactions.