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The Effect of a Magnetic Field on Photoinduced Electron Transfer in Solutions of Chlorophyll and Porphyrins

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Abstract

It is found that, with the action of photoexcitation and a variable magnetic field on halide-containing porphyrin solutions, a differential absorption is observed, whose spectra conform to the absorption spectra of cation radicals of pigments. It is shown that the effect increases linearly with an increase in the strength of a supplementary magnetic field (H) up to saturation (H max 200 ≈ G). The scheme of the photophysical and photochemical deactivation of the energy of electronic excitation for chlorophyll-like pigments in the presence of CCl4 is analyzed with allowance for the effect of the magnetic field on the intercombination conversion in an ion–radical pair. It is shown that solvate-separated ion radicals of the pigments in halide-containing solutions can be formed from the singlet state of tetrapyrrole molecules.

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  1. Belarusian State University, 4 F. Skorina Ave., Minsk, 220050, Belarus

    V. V. Gurinovich & M. P. Tsvirko

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  1. V. V. Gurinovich
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  2. M. P. Tsvirko
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Gurinovich, V.V., Tsvirko, M.P. The Effect of a Magnetic Field on Photoinduced Electron Transfer in Solutions of Chlorophyll and Porphyrins. Journal of Applied Spectroscopy 67, 1016–1022 (2000). https://doi.org/10.1023/A:1004180623365

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  • DOI: https://doi.org/10.1023/A:1004180623365

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