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- W2950147804 abstract "Fluorescence lifetimes and intensities have been examined for 1, N6‐ethenoadenosine (eAdo), 1‐methylethenoadenosine (m1eAdo+), 9‐methylethenoadenosine (m9eAdo+), N1‐deazaethenoadenosine (N1 deaza‐eAdo), and 9‐methyl‐N1‐deazaethenoadenosine (m 9N1deaza‐eAdo+) at various pH′s in the 7.5–0.5 region and at 25 °C. From an analysis, the following conclusions are reached: (1) The strong fluorescence of eAdo is caused by the neutral form (but not protonated form) of its excited state (eAdo*). (2) The protonation of eAdo* takes place at position 9 (but not position 1) with the rate constant of 1.45×1010 s−1 M−1, and the deprotonation of H9 eAdo+* with the rate constant of 1.15×109 s−1, so that the excited state pK*a is 1.10. (3) In the lower pH solution, the fluorescence of eAdo is lowered partly by a proton‐induced radiationless transition of the neutral eAdo* itself, and partly through the protonation of eAdo into (eAdoH+)*, which is also subjected to a proton‐induced radiationless transition. All of the ten rat..." @default.
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- W2950147804 date "1982-01-05" @default.
- W2950147804 modified "2023-09-26" @default.
- W2950147804 title "ChemInform Abstract: RATE OF PHOTOCHEMICAL PROTONATION AND ELECTRONIC RELAXATION OF EXCITED 1,N6-ETHENOADENOSINE IN ITS AQUEOUS SOLUTION" @default.
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- W2950147804 doi "https://doi.org/10.1002/chin.198201055" @default.
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