Electron transfer in photosensitization of biomolecules by acridine dyes

Van de Vorst, A.; Lion, Y.

Photochemistry and Photobiology 21(2): 85-89

1975


ISSN/ISBN: 0031-8655
PMID: 166394
DOI: 10.1111/j.1751-1097.1975.tb06633.x
Accession: 040000321

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Abstract
The photosensitization of some biomolecules by proflavine was studied using the technique of electron paramagnetic resonance. It was shown that this process is directly influenced by the relative molar concentration of dye and substrate. For some values of these concentrations, a singlet associated with a radical form of proflavine is observed. The appearance of this signal is discussed in terms of electron transfer from an ionized proflavine molecule directly to another neutral dye molecule or via a molecule of substrate as an intermediate. It is shown that this transfer is facilitated by stacking. These results were compared with radiolysis of the same kind of complexes in frozen aqueous solution.

Electron transfer in photosensitization of biomolecules by acridine dyes