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- W2082185109 abstract "The ground state ionization constants pKa(S0) of β-carboline and three of its derivatives (harmane, harmine and 2-methylharmine) were measured spectrophotometrically in aqueous solutions. The corresponding pKa(S1) of the first excited singlet state was calculated by means of the Förster cycle from the absorption and emission spectra. It was also established that protonated β-carboline cations are responsible for photoabsorption and fluorescence in acidic solutions. However, in alkaline solutions excitation of the neutral species leads to formation of the protonated β-carboline cations by rapid proton transfer from the solvent. A zwitterion species is produced by diffusion-controlled quenching of the excited state cation by OH− ions." @default.
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- W2082185109 date "1983-12-01" @default.
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- W2082185109 title "Acidity constants of β-carbolines in the ground and excited singlet states" @default.
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- W2082185109 doi "https://doi.org/10.1016/0047-2670(83)87109-3" @default.
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