On estimating probability of excited-state intramolecular proton transfer |
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Authors: | V I Tomin |
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Institution: | (1) Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit Amsterdam, The Netherlands |
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Abstract: | Higher singlet states can play an important role in various intramolecular processes. Recent investigations of the time-resolved
(with a picosecond resolution) spectra of the dual fluorescence of 3-hydroxyflavone molecules excited in the region of the
S
1 and S
2 absorption bands by pulses with a duration of ∼44 ps have directly shown the occurrence of the proton transfer from the carboxyl
to the carbonyl group of the molecule upon excitation into the second singlet absorption band. The reaction times estimated
from the emission characteristics are comparable with the electronic level lifetime (several picoseconds), as a result of
which the direct measurements are rather difficult. The proton transfer through the S
2 state is also recorded in the steady-state fluorescence excitation spectra. In this study, it is shown how the reaction rate
can be estimated from these data. |
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Keywords: | |
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