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- W2100482839 endingPage "4962" @default.
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- W2100482839 abstract "The excited-state dynamics of kynurenine (KN) has been examined in various solvents by femtosecond-resolved optical spectroscopy. The lifetime of the S1 state of KN amounts to 30 ps in aqueous solutions, increases by more than 1 order of magnitude in alcohols, and exceeds 1 ns in aprotic solvents such as DMSO and DMF, internal conversion (IC) being shown to be the main deactivation channel. The IC rate constant is pH independent but increases with temperature with an activation energy of about 7 kJ/mol in all solvents studied. The dependence on the solvent proticity together with the observation of a substantial isotope effect indicates that hydrogen bonds are involved in the rapid nonradiative deactivation of KN in water. These results give new insight into the efficiency of KN as a UV filter and its role in cataractogenesis." @default.
- W2100482839 created "2016-06-24" @default.
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- W2100482839 date "2009-03-18" @default.
- W2100482839 modified "2023-10-16" @default.
- W2100482839 title "Ultrafast Excited-State Dynamics of Kynurenine, a UV Filter of the Human Eye" @default.
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- W2100482839 doi "https://doi.org/10.1021/jp900541b" @default.
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