The effects of intermolecular hydrogen bonding on the molecular properties of barbituric acid (BA) and thiobarbituric acid are discussed on the basis of density functional theory calculations. B3LYP methods were applied to monomers and cyclic dimers. Trimer and hexamer of BA were studied as examples where several C=O and NH groups are involved in hydrogen bonding. The theoretical IR spectra of monomers and all oligomers here considered are compared with the FT-IR spectra measured in Ar and nitrogen matrices at different concentrations. © 2001 Elsevier Science B.V. All rights reserved.
Hydrogen bonding in barbituric and 2-thiobarbituric acids: a theoretical and FT-IR study / Ramondo, Fabio; Pieretti, Andrea; Gontrani, Lorenzo; Bencivenni, Luigi. - In: CHEMICAL PHYSICS. - ISSN 0301-0104. - STAMPA. - 271:3(2001), pp. 293-308. [10.1016/S0301-0104(01)00440-2]
Hydrogen bonding in barbituric and 2-thiobarbituric acids: a theoretical and FT-IR study
Ramondo, Fabio
;PIERETTI, Andrea;Gontrani, Lorenzo;Bencivenni, Luigi
2001
Abstract
The effects of intermolecular hydrogen bonding on the molecular properties of barbituric acid (BA) and thiobarbituric acid are discussed on the basis of density functional theory calculations. B3LYP methods were applied to monomers and cyclic dimers. Trimer and hexamer of BA were studied as examples where several C=O and NH groups are involved in hydrogen bonding. The theoretical IR spectra of monomers and all oligomers here considered are compared with the FT-IR spectra measured in Ar and nitrogen matrices at different concentrations. © 2001 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
