Localization of positive charge in DNA induced by its interaction with environment

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dc.creatorUskov, Dmitry B.
dc.creatorBurin, Alexander L.
dc.date2008-03-15
dc.date2008-06-06
dc.date.accessioned2026-07-07T09:42:46Z
dc.date.available2026-07-07T09:42:46Z
dc.descriptionMicroscopic mechanisms of positive charge transfer in DNA remain unclear. A quantum state of electron hole in DNA is determined by the competition of the pi-stacking interaction $b$ sharing a charge between different base pairs and the interaction $λ$ with the local environment which attempts to trap charge. To determine which interaction dominates we investigated charge quantum states in various $(GC)_{n}$ sequences choosing DNA parameters satisfying experimental data for the balance of charge transfer rates $G^{+} \leftrightarrow G_{n}^{+}$, $n=2,3$ \cite{FredMain}. We show that experimental data can be consistent with theory only assuming $b\ll λ$ meaning that charge is typically localized within the single $G$ site. Consequently any DNA sequence including the one consisting of identical base pairs behaves more like an insulating material then a molecular conductor. Our theory can be verified experimentally, for instance measuring balance of charge transfer reactions $G^{+} \leftrightarrow G_{n}^{+}$, $n \geq 4$ and comparing the experimental results with our predictions.
dc.descriptionSubmitted to the Journal of Chemical Physics
dc.identifierhttps://arxiv.org/abs/0803.2266
dc.identifierhttp://arxiv.org/abs/0803.2266
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/162305
dc.subjectSoft Condensed Matter
dc.titleLocalization of positive charge in DNA induced by its interaction with environment
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