title: Dynamics of ultrafast singlet and triplet charge transfer in anthraquinone-DNA conjugates.
abstract: The efficiency of singlet and triplet charge radical ion-pair formation and the dynamics of radical-pair charge recombination in DNA-anthraquinone conjugates have been investigated by means of femtosecond time-resolved transient absorption spectroscopy. Singlet charge separation is more efficient than intersystem crossing, resulting in inefficient formation of the long-lived triplet radical ion pair. Both singlet charge separation and charge recombination are faster when guanine rather than adenine is the neighboring purine base.
authors.affiliation: Department of Chemistry and Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, Illinois 60208-3113, USA. fdl@northwestern.edu
authors.forename: Frederick D
authors.initials: FD
authors.lastname: Lewis
authors.forename: Arun K
authors.initials: AK
authors.lastname: Thazhathveetil
authors.forename: Tarek A
authors.initials: TA
authors.lastname: Zeidan
authors.forename: Josh
authors.initials: J
authors.lastname: Vura-Weis
authors.forename: Michael R
authors.initials: MR
authors.lastname: Wasielewski
mesh_terms: D000880:Anthraquinones / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D015394:Molecular Structure; D011789:Quantum Theory
chemical_list: D000880:Anthraquinones; D004247:DNA