투고논문

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

Jeong Chul Choi and Kwang-Jin Hwang*

Department of Bio & Chemical Engineering, Hongik University, 2639 Sejongro, Jochiwon, Sejong 30016, Korea

Abstract 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 CDCl₃. The substitution reaction of titanium tetraisopropoxide with carboxylic acid was applied to form dye-Ti complex for dye-sensitized solar cell.