Issue 5, 2008

Getting to guanine: mechanism and dynamics of charge separation and charge recombination in DNA revisited

Abstract

The mechanism and dynamics of charge separation and charge recombination in synthetic DNA hairpins possessing a stilbenedicarboxamide linker and a single guanine–cytosine base pair have been reinvestigated. The combination of femtosecond broad-band pump probe spectroscopy, nanosecond transient absorption experiments, and picosecond fluorescence decay measurements permits analysis of the formation and decay of the stilbene anion radical. Reversible hole injection resulting in the formation of the stilbene–adenine contact radical ion pair is found to occur on the picosecond time scale. The mechanism for charge separation across two or more base pairs is revised from single step superexchange to a multi-step process: hole injection followed by hole transport and hole trapping. The mechanism of charge recombination remains assigned to a superexchange process.

Graphical abstract: Getting to guanine: mechanism and dynamics of charge separation and charge recombination in DNA revisited

Supplementary files

Article information

Article type
Paper
Submitted
21 Dec 2007
Accepted
15 Feb 2008
First published
13 Mar 2008

Photochem. Photobiol. Sci., 2008,7, 534-539

Getting to guanine: mechanism and dynamics of charge separation and charge recombination in DNA revisited

F. D. Lewis, H. Zhu, P. Daublain, K. Sigmund, T. Fiebig, M. Raytchev, Q. Wang and V. Shafirovich, Photochem. Photobiol. Sci., 2008, 7, 534 DOI: 10.1039/B719715B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements