[The circular dichroism spectrum of dinucleoside phosphate analogs]

Circular dichroism spectra of 11 analogues of the dinucleoside phosphate containing achiral 3'-terminal monomers have been measured at several pH values, various temperatures and various concentrations of ethanol. The conformation of analogues studied has been shown to by very similar to that of natural compounds. Comparison of the results obtained with the circular dichroism spectra of the corresponding natural compounds indicates that Cotton effect arises from monomeric circular dichroism, at least in main features. The exciton interaction is relatively small.