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- W2011041132 abstract "Abstract In aqueous solution, the 4′-methylflavylium ion ( A H + ) can be interconverted into several different forms by light excitation and/or pH changes. All the observed processes are fully reversible and accompanied by strong changes in absorption and emission spectra. At pH A H + ). By increasing pH, A H + is no longer stable and undergoes structural transformations that at pH>3 lead to the uncoloured trans -chalcone ( Ct ) as a final product. This transformation occurs through the hemiacetal form ( B2 ) and the cis -chalcone ( Cc ) isomer. This mixture is relatively inert due to the existence of a kinetic barrier that slows down the thermal isomerisation of Cc to the final Ct form. Ct is photosensitive and can be backconverted by light excitation into Cc which at low pH rapidly gives the A H + species. In basic solution, two more species were detected, the anionic forms ( Cc − and Ct − ) of the cis and trans -chalcone. Ct − is a stable, not photosensitive species, whereas Cc − is not stable, being converted into Ct − in the dark. A detailed analysis of the chemical behaviour of 4′-methylflavilium ion from the viewpoint of molecular level device shows that this compound behaves as a multistate / multifunctional system." @default.
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- W2011041132 date "2000-10-01" @default.
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- W2011041132 title "Light and pH switching between the various forms of the 4′-methylflavylium cation" @default.
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