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• W2054106397 abstract "Alkyl aryl ketones undergo Type II photoreaction both on a silica-gel surface and in solution. The amount of acetophenone produced from valerophenone increases linearly with increase in the amount of valerophenone loaded at coverage below ca 60%. The effect of the alkyl chain length on the Type II photoreactivity of alkyl phenyl ketones on the surface is weak. The relative quantum yields ΦMeAP/ΦAP and ΦMeOAP/ΦAP on the surface are lower than those in benzene containing 0.5 M pyridine. A silica-gel surface provides a polar reaction medium that makes the energy difference between the lowest n,π* and the upper π,π* triplet states small and may cause the inversion of the nearby n,π* and π,π* triplet states. The filter effect is trivial in surface photochemistry when all loaded molecules are in the monomolecular layer. The energy transfer processes are observed in the valerophenone–p-methylvalerophenone and valerophenone–p-methoxyvalenophonone systems in which the internal filter effects are so strong that the energy transfer processes cannot be observed directly in solution. Although the Stern–Volmer quenching kinetics would be applicable to the photoreaction on the surface, a correction for the probability of excitation of a molecule should be made. Copyright © 2000 John Wiley & Sons, Ltd." @default.
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• W2054106397 date "2000-01-01" @default.
• W2054106397 modified "2023-10-18" @default.
• W2054106397 title "Surface photochemistry of alkyl aryl ketones: energy transfer and the effect of a silica-gel surface on electronic states of excited molecules" @default.
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• W2054106397 doi "https://doi.org/10.1002/1099-1395(200008)13:8<437::aid-poc252>3.0.co;2-1" @default.
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