Fluorescence quenching of photoreaction products in the excited singlet state |
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Authors: | V I Tomin |
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Institution: | (1) Institute of Physics, Pomeranian University, Slupsk, Poland |
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Abstract: | The properties of steady-state spontaneous luminescence of a quantum system with a photoproduct with recordable fluorescence
under the conditions of dynamic quenching of excited states by extraneous substances were considered. It was shown that the
dependence of photoproduct fluorescence intensity and yield on quencher concentration was nontrivial and could not be conveniently
used to determine the Stern-Volmer constant. At the same time, the initial form of the luminophore and its photoproduct produced
in a kinetically controlled reaction are quenched in such a way that the ratio of their fluorescence intensities increases
linearly as the quencher concentration grows. The corresponding equation was used to determine the constant of bimolecular
quenching of reaction product excited states. The results were used in an analysis of the experimental fluorescence spectra
of flavone (3-hydroxiflavone), whose fluorescence was excited under the conditions of dynamic quenching of the S
1 state. Our analysis was shown to be applicable to a wide range of compounds with photoreactions accompanied by two-band fluorescence
(charge transfer, proton transfer, phosphorescence, complex formation, etc.). It could be used to accurately determine bimolecular
contact constants for excited states of photoreaction product molecules.
Original Russian Text ? V.I. Tomin, 2009, published in Zhurnal Fizicheskoi Khimii, 2009, Vol. 83, No. 3, pp. 580–585. |
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