The structure and properties of TiO2-Cu(II)-EDTA ternary surface complexes

The formation, composition, structure, and electrochemical properties of te rnary surface complexes between copper(II) and ethylenediaminetetraacetate adsorbed on TiO2 xerogels and on thin-film TiO2 electrodes from solutions o f varying pH have been studied by potentiometry, EPR spectroscopy, and elec trochemical methods. The results strongly indicate that, in contrast to oth er organic ligands, B-type ternary surface complexes are formed in this sys tem. The organic ligand forms an isolating layer between the surface of the TiO2 electrode and the redox-active copper ions. (C) 2001 Academic Press.