Abstract
The optical rotatory dispersion of 16 dinucleoside phosphates has been calculated. The exciton interactions among electronic transition moments above 220 mμ have been considered. Directions and magnitudes of the transition moments of the bases were obtained from the absorption spectra. Agreement between calculation and experiment is satisfactory for ApA, UpU, ApU, UpA, ApG and GpA. It is concluded that the dinucleoside phosphates contain stacked bases which form a right-handed helix. The calculations are consistent with the ORD differences between sequence isomers; they predict the small difference between ApU and UpA, and the large difference between ApG and GpA.
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