DFT Meets Wave-Function Composite Methods for Characterizing Cytosine Tautomers in the Gas Phase.

ABSTRACT: A general strategy for the accurate computation of structural and spectroscopic properties of biomolecule building blocks in the gas phase has been further improved and validated with a special reference to tautomeric equilibria. The main improvements concern the use of the cc-pVTZ-F12 basis set in both DFT and CCSD(T)-F12 computations, the inclusion of core-valence correlation in geometry optimizations by double hybrid functionals, and the use of the cc-pVQZ-F12 basis set for complete basis set extrapolation at the MP2-F12 level. The resulting model chemistry is applied to the challenging problem of cytosine tautomers in the gas phase. The results are in remarkable agreement with experiment concerning both rotational and vibrational spectroscopic parameters and permit their unbiased inter

SUBMITTER: Barone V 

PROVIDER: S-EPMC10413851 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature