IR matrix isolation studies of nucleic acid constituents: the spectrum of monomeric thymine

Abstract

The IR matrix isolation spectra of thymine and N 1, N 3-dideuterated thymine in argon and nitrogen matrices are reported. The spectra are interpreted by comparison with the previously assigned spectra of uracil. The frequencies of the NH stretching and bending modes are not much changed on methyl substitution in the 5-position of the uracil ring. The most pronounced differences are observed in the frequency region of the ring vibrations.