Photochemical Processes in Aqueous Solutions of Immunoactive 8-Azasteroid |
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| Authors: | N A Borisevich V L Dubovskii A L Mikhal'chuk T F Raichenok S A Tikhomirov G B Tolstorozhev |
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| Institution: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus;(2) Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus |
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| Abstract: | Based on an analysis of the absorption, fluorescence excitation, and fluorescence spectra, and the duration of the excited states of an aqueous solution (pH 7.4) of 2,3-dimethoxy-8-azagona-1,3,5(10),13-tetraen-12,17-dione molecules, the existence of two centers emitting longwave (L centers) and shortwave (S centers) fluorescence has been established. Irradiation of the solution accelerates the accumulation of L centers and considerably reduces the quantity of S centers that represent the initial molecule. Analysis of the induced-absorption spectra and their kinetics with picosecond time resolution shows that ionization of the molecule studied is the initial photochemical act and formation of a dehydro derivative of the initial molecule or protonation of carbonyl groups is the next act. |
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| Keywords: | 8-azasteroids aqueous solution photoionization photochemical processes |
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