
%0 Journal Article
%A Connell, KE 
%A Kurucsev, T 
%A Norden, B 
%T Electronic-Transitions in the Near-Ultraviolet Spectra of Uracil, Thymine, Uridylyl(3'-5')uridine and Thymidylyl(3'-5')thymidine
%J Australian Journal of Chemistry
%D 1988/10/01
%V 41
%N 10
%P 1509-1522
%K 
%R https://doi.org/10.1071/CH9881509
%U https://www.publish.csiro.au/paper/CH9881509 
%X The absorption spectra in the near-ultraviolet region of uracil and thymine, and of their derivatives may be deconvoluted into two vibronic progressions; the higher-energy progression has a relatively low intensity. The corresponding component spectra coincide with the two separate transitions manifested in the circular dichroism of the relevant nucleoside derivatives. A series of apparent contradictions may be resolved by the assumption that the higher-energy transition in absorption is a vibronically allowed (&#960;*,n) transition. This interpretation is further supported by an analysis of the spectra of uridylyl (3&#8242;-5&#8242;) uridine and thimidylyl (3&#8242;-5&#8242;) thymidine in terms of exciton interactions. The magnitude of exciton coupling in the dinucleoside phosphates is found to be small but significant in terms of energy transfer rates. 
