Dynamics of photochemical electron injection and efficiency of electron transport in DNA

Pierre Daublain, Arun K. Thazhathveetil, Qiang Wang, Anton Trifonov, Torsten Fiebig*, Frederick D. Lewis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The dynamics of electron injection and quantum yields for photoinduced dehalogenation have been investigated in a series of DNA hairpins possessing an aminopyrene capping group. Aminopyrene serves as an electron donor and is separated from a bromo- or iodoracil electron trap by 1 to 7 A-T base pairs. Broad band femtosecond transient absorption spectra and fluorescence quantum yield measurements are indicative of rapid and efficient charge separation. The resulting charge-separated state decays predominantly via charge recombination on the picosecond time scale. Steady-state irradiation in the presence of 0.1 M i-PrOH results in loss of halogen and conversion of the halouracil-containing conjugates to the corresponding uracil-containing conjugates in high yield. Dehalogenation occurs via a multistep mechanisms consisting of electron injection, electron transport to the halouracil, loss of halide, and trapping of the uracilyl radical. Quantum yields for product formation decrease by a factor of 2 for each additional A-T base pair interposed between the aminopyrene and bromouracil. This distance dependence is similar to that observed in our studies of DNA hole transport in stilbene donor-acceptor capped hairpins; however, the quantum yields for product formation are much lower for the aminopyrene conjugates as a consequence of more rapid charge recombination.

Original languageEnglish (US)
Pages (from-to)16790-16797
Number of pages8
JournalJournal of the American Chemical Society
Volume131
Issue number46
DOIs
StatePublished - Nov 27 2009

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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