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• W2051235612 abstract "The radical ions (SCN)2•- and I2•- were produced by photocatalytic flash excitation (355 nm) of oxygenated TiO2 sols suspended in 1.00 M aqueous solutions of KSCN or KI. To determine the effect of surface heterogeneity of the photocatalyst on the secondary reactions of these transients, these radical ions were reacted with a series of electron donors. The resulting heterogeneous rate constants are compared to those known for the same reactions in homogeneous solution, where (SCN)2•- and I2•- were generated by pulse radiolysis. Relative to the solution phase, the reaction between (SCN)2•- and ascorbic acid on a TiO2 sol was accelerated by approximately a factor of 40, that between (SCN)2•- and hydroquinone was essentially unchanged, and that between (SCN)2•- and cysteine was slowed by approximately an order of magnitude. The dismutation of (SCN)2•- on TiO2 was accelerated by a factor of 3. The reaction of I2•- with cysteine on a TiO2 sol was approximately 25 times slower than that in solution, and its dismutation was accelerated by a factor of 4. These changes in kinetic selectivity are explained by the association of the photocatalytically generated radical ion with the TiO2 surface." @default.
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• W2051235612 date "1998-03-01" @default.
• W2051235612 modified "2023-10-16" @default.
• W2051235612 title "Effect of the TiO₂ Surface on the Reactivity of Photocatalytically Generated (SCN)₂^•^- and I₂^•^-" @default.
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• W2051235612 doi "https://doi.org/10.1021/la9711600" @default.
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