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Zuzana Barbieriková, Mária Mihalíková and Vlasta Brezová Photoinduced Oxidation of Sterically Hindered Amines in Acetonitrile Solutions and Titania Suspensions (An EPR Study) Photochemistry and Photobiology 88

Version of Record online: 26 JUL 2012 | DOI: 10.1111/j.1751-1097.2012.01189.x

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The reactions of sterically hindered amines (SHA) were investigated in acetonitrile solutions and TiO2 suspensions upon exposure to monochromatic radiation (λ = 365 nm) by in situ EPR spectroscopy. Experiments in homogeneous media using KO2 and H2O2 evidenced alternative pathways for the SHA oxidation with a variety reactive oxygen species (ROS) involved. The influence of competitive reactions of SHA with ROS formed upon TiO2 photoexcitation was investigated in a series of experiments using different additives (e.g. KO2, H2O2, NaN3, dimethylsulfoxide and methanol) under air or argon. The detailed analysis of paramagnetic intermediates formed upon the irradiation of the studied systems was accomplished using an EPR spin trapping technique.

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