Abstract
Comparative analysis of the geometry, atomic charges, force constants, and IR spectra of crystals of isomeric 5- and 6-methyluracils was performed by quantum-chemical methods. Dimeric and trimeric associates of C-methyluracil molecules and their dimers with adenine were calculated in order to estimate the energies of intramolecular hydrogen bonds. Thymine in DNA is impossible to replace by 6-methyluracillargely by steric reasons.
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