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• W2033612258 abstract "The proposed role of anthocyanins in protecting plants against excess solar radiation is consistent with the occurrence of ultrafast (5–25 ps) excited-state proton transfer as the major de-excitation pathway of these molecules. However, because natural anthocyanins absorb mainly in the visible region of the spectra, with only a narrow absorption band in the UV-B region, this highly efficient deactivation mechanism would essentially only protect the plant from visible light. On the other hand, ground-state charge-transfer complexes of anthocyanins with naturally occurring electron-donor co-pigments, such as hydroxylated flavones, flavonoids, and hydroxycinnamic or benzoic acids, do exhibit high UV-B absorptivities that complement that of the anthocyanins. In this work, we report a comparative study of the photophysics of the naturally occurring anthocyanin cyanin, intermolecular cyanin–coumaric acid complexes, and an acylated anthocyanin, that is, cyanin with a pendant coumaric ester co-pigment. Both inter- and intramolecular anthocyanin–co-pigment complexes are shown to have ultrafast energy dissipation pathways comparable to those of model flavylium cation–co-pigment complexes. However, from the standpoint of photoprotection, the results indicate that the covalent attachment of co-pigment molecules to the anthocyanin represents a much more efficient strategy by providing the plant with significant UV-B absorption capacity and at the same time coupling this absorption to efficient energy dissipation pathways (ultrafast internal conversion of the complexed form and fast energy transfer from the excited co-pigment to the anthocyanin followed by adiabatic proton transfer) that avoid net photochemical damage." @default.
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• W2033612258 date "2012-02-14" @default.
• W2033612258 modified "2023-10-03" @default.
• W2033612258 title "Photoprotection and the Photophysics of Acylated Anthocyanins" @default.
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• W2033612258 doi "https://doi.org/10.1002/chem.201102247" @default.
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