Pecularities of electronic interaction of polar and non-polar organic fluorescent probes in the mixed titania-silica compositions
Анотація
Spectral characteristics of polar - push-pull stilbene (St) and nonpolar pyrene (Py) molecules on the silica and silica-titania surfaces have been studied by the methods of steady-state and momentary spectrofluorimetiy. Photochemistry of Py molecules in microheterogeneous media titania-silica colloids is controlled at presence of cyclodextrine. Change of the spectral position of the fluorescence maxima of stilbenes and lifetimes of stilbenes correlated with the change of local polarity around the adsorbed species due to competitive adsorption of water molecules from air and removing of adsorbed stilbenes to places with lower polarity. Stilbenes fluorescence is quenched effectively and this quenching is attributed to electron injection from excited stilbene to titania.
Посилання
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