Spectral-polarization studies of electron transfer processes in the system eosin Y - titanium dioxide - polyethylene glycol

Abstract

Interaction of an anionic nanomarker - eosin Y with titanium dioxide and polyethylene glycol (PEG) in aqueous solutions was studied using polarization spectroscopy methods. The observed increase in the anisotropy of eosin Y fluorescence upon going from an aqueous solution to PEG and a suspension of titanium dioxide indicates the binding of the nanomarker to PEG and sorption on titanium dioxide particles.
The processes of quenching the fluorescence of eosin Y with an increase in the concentration of titanium dioxide in aqueous solutions have been investigated. It was shown that the quenching of eosin fluorescence occurs via the mechanism of electron transfer from eosin Y, which is in an excited singlet state, to titanium dioxide. Using the modified Stern-Volmer equation, the quenching constant of eosin Y fluorescence was determined. It was found that the quenching constant decreases in the PEG-titanium dioxide system. It is assumed that this is due to the shielding of eosin by PEG from the titanium dioxide surface.

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Denis A. Bykov
Saratov State Technical University
Russia

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