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Interaction of Stilbenes with TiO2 Studied by Fourier IR Spectroscopy K. E. Polunin, N. P. Sokolova, A. M. Gorbunov, R. A. Bulgakova, and I. A. Polunina Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
31 Leninskii pr., Moscow, 119991, Russia e-mail:
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Received February 29, 2008 Abstract — Adsorption interactions of stilbene (1,2-diphenylethylene) and its hydroxy- and methoxyderivatives with nanodispersed TiO2 aerogel surface were studied by means of Fourier IR radiosity spectroscopy. Stilbene trans- and cis-isomers were shown to be weakly adsorbed on TiO2 surface forming hydrogen bonds. UV irradiation (wavelength 285–305 nm) of adsorbed compounds results in their partial destruction, yielding aldehydes, ketones, and carboxylates. The products of stilbene photolysis are strongly bound to TiO2 surface. Modification of TiO2 surface with trans-hydroxystilbenes is characterized by the formation of various hydrogen bonds and surface colored quinoid compounds. The interaction of TiO2 with trans-methoxystilbenes changes the state of surface hydroxyl groups and yields stable carboxylate compounds. UV irradiation results in the partial destruction of adsorbed stilbenoids, yielding aldehyde, ketone, and carboxylate surface compounds. PACS numbers: 68.43.-h DOI: 10.1134/S2070205109060082
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