Abstract
Photo-oxidation of cyclohexane and adamantane was carried out in a semiconductor particulate system containing Pt/TiO 2/RuO 2 semiconductor powder, [Ru III(EDTA—H)Cl] − ( 1) complex as catalyst, and the substrate (cyclohexane, adamantane) in water-dioxane medium. Illumination of the system at 390 nm (energy equivalent to the band-gap energy of TiO 2) produces cyclohexanol and 1-adamantanol at rates of 1.92 × 10 −6 mol h −1 and 1.33 × 10 −6 mol h −1, respectively. Trace amounts of cyclohexanone, 2-adamantanol, and 2-adamantanone were also detected in the reaction system. In the absence of complex 1 the reaction gives negligible amounts of oxidation products. A mechanism involving oxygen-atom transfer from the photogenerated [Ru v(EDTA)(O)] − ( 2) complex to the substrates has been proposed for the photo-oxidation reaction.
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