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The FT-EPR spectra of the anthraquinone-2,6-disulfonic acid radicals as probe for local proton concentrations in electron transfer reactions

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Abstract

The radical anion of anthraquinone-2,6-disulfonic acid (2,6-AQDS) and different donor radical cations are formed by electron transfer from various pyrimidines to the laser-induced triplet state of 2,6-AQDS. The electron paramagnetic resonance (EPR) spectrum of the radical anion changes drastically with pH due to different protonated forms of this radical. These EPR spectra were used to define an effective pH value as a measure of the local proton (H3O+) concentration in the surroundings of the 2,6-AQDS radical anion in a unbuffered solution. In some cases this effective pH value was found to be time-dependent reflecting the evolution of the protonation and deprotonation processes of acceptor and donor.

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  1. Interdisciplinary Group for Time-Resolved Spectroscopy, University of Leipzig, Leipzig, Germany

    J. Geimer & D. Beckert

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  1. J. Geimer
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  2. D. Beckert
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Geimer, J., Beckert, D. The FT-EPR spectra of the anthraquinone-2,6-disulfonic acid radicals as probe for local proton concentrations in electron transfer reactions. Appl. Magn. Reson. 18, 505–513 (2000). https://doi.org/10.1007/BF03162297

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  • DOI: https://doi.org/10.1007/BF03162297

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