Are adenine strands helical H-aggregates?
On the basis of our quantum mechanical calculation, we propose that homogeneous single-stranded adenine bases (Ade-DNA) form helical H aggregates, and the photoexcited states can be described as Frenkel excitons. The calculated excitonic coupling between adjacent transition dipoles is in good agreement with the measured absorption spectrum of 20-base homogeneous adenine stacks that exhibits a blue shift of 2.6 nm relative to that of the monomeric species.
Hu
Lihong
L
Department of Chemistry and Centre of Theoretical and Computational Physics, University of Hong Kong, Hong Kong, PR China.
Zhao
Yang
Y
Wang
Fan
F
Chen
GuanHua
G
Ma
Chensheng
C
Kwok
Wai-Ming
WM
Phillips
David Lee
DL
D009690:Nucleic Acid Conformation; D011061:Poly A / Q000737:chemistry*; D013053:Spectrophotometry
D011061:Poly A; C015465:poly(dA)