Distance-Dependent Activation Energies for Hole Injection from Protonated 9-Amino-6-chloro-2-methoxyacridine into Duplex DNA

The recent investigation of the apparently anomalous attenuation factor ( beta > 1.5 Ae super(-1)) for photoinduced hole injection into DNA duplexes modified by protonated 9-amino-6-chloro-2-methoxyacridine (X super(+)) led to the conclusion that in addition to the electronic couplings, the activ...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2002-03, Vol.124 (11), p.2422-2423
Main Authors: Davis, W B, Hess, S, Naydenova, I, Haselsberger, R, Ogrodnik, A, Newton, MD, Michel-Beyerle, M-E
Format: Article
Language:English
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Summary:The recent investigation of the apparently anomalous attenuation factor ( beta > 1.5 Ae super(-1)) for photoinduced hole injection into DNA duplexes modified by protonated 9-amino-6-chloro-2-methoxyacridine (X super(+)) led to the conclusion that in addition to the electronic couplings, the activation energy must also be distance-dependent. In this communication we report the verification of this postulate by direct measurements of the activation energies for a series of (X super(+))-modified DNA duplexes which sample an appreciable range of donor-acceptor distances ( similar to 4-11 Ae). The resulting changes in thermal activation energy can be explained within the framework of a distance-dependent reorganization energy.
ISSN:0002-7863
DOI:10.1021/ja0173041