P. Piskorz et Mj. Wojcik, AB-INITIO CALCULATIONS OF HYDROGEN-BONDED DIMERS OF URACIL AND 1-METHYLURACIL, Journal of molecular structure. Theochem, 332(3), 1995, pp. 217-223
Ab initio RHF SCF/3-21G calculations have been carried out to determin
e the equilibrium geometries, vibrational frequencies and intensities
of the intermolecular modes of uracil and 1-methyluracil dimers. The r
esults are compared with the experimental low frequency infrared and R
aman spectra of the crystals. The dimer approximation for hydrogen-bon
ded crystals is discussed.