Khanina O. The processes of intermolecular photoinduced electron transfer in nanostructures titania-silica

Object: correlation between titania-silica structure and efficiency of electron transfer processes. Aim of the work is an investigation of characteristics of electron interaction of complex organic compounds with the surface of nanosized titania-silica composites and determination of correlations of catalytic activity in reactions of photomineralization of toxic organic compounds with loading of titatia, structure and photoelectrical characteristics. Products of reaction of primary electron transfer from adsorbed polyacen molecule to active surface site, which are the intermediate products of photooxidation, have been determined by laser plash-photolysis technique. Presence of nanosized anatase at the composites was shown to be decisive in photodegradation of organic substances. Fluorescence of titania-silica adsorbed stylbens and bis-pyrasolopyridin, characterized by intramolecular electron transfer has been investigated. An influence of polar solvents on formation of the state with intramolecular electron transfer on titania-silica surface has been studied. Formation of conformation with intramolecular electron transfer in adsorbed state is blocked by binding an electron-donor part of the molecule by surface active sites.