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- W57004711 abstract "The amphoteric 6-hydroxyquinoline (6HQ) molecule has a weak acidic hydroxyl function (p K A = 9.2) and a weak basic imine function (p K A = 5.1) in the ground-state [1] . A cationic (quinolinium) form 6HQ(C), an anionic (quinolinate) form 6HQ(A), and a neutral form 6HQ(N) are thus predominantly present in acidic, alkaline, and neutral aqueous solutions, respectively, according to the following acid-base equilibria: Figure options Figure options Download full-size image Download as PowerPoint slide 6HQ(N), 6HQ(C), 6HQ(A), and 6HQ(T) absorb at 326, 344, 358, and 408 nm, and fluoresce at 380, 450, 490, and 585 nm, respectively [1] and [2] . The excited state proton transfer dynamics is almost unexplored. Recent investigations by picosecond time-resolved fluorescence [3] and [4] led to opposed conclusions concerning the chronology of the double proton transfer process in neutral water. We present a sub-picosecond transient absorption investigation of the photoinduced tautomerization of 6HQ in acidic and alkaline aqueous solutions." @default.
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- W57004711 date "2004-01-01" @default.
- W57004711 modified "2023-09-25" @default.
- W57004711 title "Excited-state proton transfer dynamics of 6-hydroxyquinoline in acidic and alkaline aqueous solutions" @default.
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- W57004711 doi "https://doi.org/10.1016/b978-044451656-5/50039-6" @default.
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