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• W2894636432 startingPage "6124" @default.
• W2894636432 abstract "Lumichrome (LC) is the chromophore of the flavin family of photoactive biomolecules, where key biochemical activity involves interplay between redox and photophysical events. Questions remain about the relationship between the redox status of the ground and excited states and demand an improved understanding of the intrinsic photochemistry. Using anion photodissociation spectroscopy, we have measured the intrinsic electronic spectroscopy (564–220 nm) and accompanying photodegradation pathways of the deprotonated anionic form of LC. Experiments were also performed on alloxazine (AL), which is equivalent to LC minus two methyl groups. We observe a resonance state close to 3.8 eV for both anions for the first time, which we tentatively assign to dipole-bound excited states. For AL this state is sufficiently long-lived to facilitate dissociative electron attachment. Our results suggest that the presence of methyl group rotors at key positions along the molecular dipole may reduce the lifetime of the resonance state and hence provide a structural barrier to valence electron capture, and ensuing molecular dissociation." @default.
• W2894636432 created "2018-10-12" @default.
• W2894636432 creator A5055275630 @default.
• W2894636432 creator A5066295100 @default.
• W2894636432 date "2018-10-02" @default.
• W2894636432 modified "2023-09-24" @default.
• W2894636432 title "Observation of Near-Threshold Resonances in the Flavin Chromophore Anions Alloxazine and Lumichrome" @default.
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• W2894636432 doi "https://doi.org/10.1021/acs.jpclett.8b02529" @default.
• W2894636432 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30277786" @default.
• W2894636432 hasPublicationYear "2018" @default.
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