Dynamics of Charge Injection and Charge Recombination in DNA Mini-Hairpins

Ashutosh Kumar Mishra, Michelle A. Harris, Ryan M. Young, Michael R. Wasielewski*, Frederick D. Lewis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Steady state spectroscopy, femtosecond transient absorption spectroscopy (fsTA), and femtosecond stimulated Raman spectroscopy (FSRS) of DNA mini-hairpins possessing a diphenylacetylenedicarboxamide (DPA) linker and 1-3 adenine-thymine (A-T) or guanine-cytosine (G-C) base pairs have been investigated. Ultraviolet and circular dichroism (UV and CD) spectra are consistent with ground state conformations that are predominantly base-paired and π-stacked for conjugates possessing two or three base pairs; however, they offer no information concerning the conformation of conjugates possessing a single base pair. fsTA spectra are indicative of π-stacked structures excepted in the case of the conjugate possessing a single G-C base pair. All of the conjugates display transient absorption bands characteristic of the DPA-. anion radical. Conjugates possessing two or three G-C base pairs display a transient absorption band characteristic of the short-lived G+• cation radical. The mini-hairpins with 1-3 A-T base pairs do not display the transient absorption band characteristic of the (An+•) polaron. This implies that an A-tract with three base pairs is too short to support polaron formation.

Original languageEnglish (US)
Pages (from-to)7042-7047
Number of pages6
JournalJournal of Physical Chemistry B
Issue number29
StatePublished - Jul 27 2017

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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