NMR Analysis of the Substitution of Titanium Tetraisopropoxide with Phenol and Carboxylic Acid

NMR Analysis of the Substitution of Titanium Tetraisopropoxide with Phenol and Carboxylic Acid

Titanium phenoxide and titanium carboxylate derivatives were prepared by ligand exchange of titanium tetraisopropoxide with the corresponding phenol and carboxylic acids. The substitution reactions were analyzed by NMR focused in the liberation of isopropylalcohol. The chemical shift of secondary proton of isopropyl group shifted to upfield after liberation; from 4.47 ppm at titanium-bound to 4.1~4.3 ppm at free alcohol state in $CDCl_3$. The substitution reaction of titanium tetraisopropoxide with carboxylic acid was applied to form dye-Ti complex for dye-sensitized solar cell.