Dynamics of ultrafast singlet and triplet charge transfer in anthraquinone-DNA conjugates.
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.
Lewis
Frederick D
FD
Department of Chemistry and Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, Illinois 60208-3113, USA. fdl@northwestern.edu
Thazhathveetil
Arun K
AK
Zeidan
Tarek A
TA
Vura-Weis
Josh
J
Wasielewski
Michael R
MR
D000880:Anthraquinones / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D015394:Molecular Structure; D011789:Quantum Theory
D000880:Anthraquinones; D004247:DNA