Ft-ir spectroscopic study of uracil derivatives and their hydrogen-bonded complexes with model proton donors .6. proton-transfer in uracil - hcl complexes isolated in concentrated or strongly annealed argon matrices

Graindourze, M; Smets, J; Zeegershuyskens, T; Maes, Guido

doi:10.1016/0022-2860(93)07902-9

Ft-ir spectroscopic study of uracil derivatives and their hydrogen-bonded complexes with model proton donors .6. proton-transfer in uracil - hcl complexes isolated in concentrated or strongly annealed argon matrices

Author:

Graindourze, M

Smets, J ; Zeegershuyskens, T ; Maes, Guido

Keywords:

isolation vibrational spectroscopy, infrared-spectra, chloride complex, n-methylpiperidin-2-one, absorptions, pyridine, halides, dimers, Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, ISOLATION VIBRATIONAL SPECTROSCOPY, INFRARED-SPECTRA, CHLORIDE COMPLEX, N-METHYLPIPERIDIN-2-ONE, ABSORPTIONS, PYRIDINE, HALIDES, DIMERS, 0306 Physical Chemistry (incl. Structural), 0307 Theoretical and Computational Chemistry, Inorganic & Nuclear Chemistry, 3402 Inorganic chemistry

Abstract:

FT-IR spectra are reported for mixtures of uracils with relatively large amounts of hydrogen chloride in annealed Ar matrices. The observation of spectral characteristics typical for C=O+ ... Cl- ... (HCl)n species demonstrates that hydrogen bonding of one or more additional proton donor molecules to the rather strong 1:1 complex C = O ... HCl leads to partial proton transfer. Isotopic ratios obtained from HCl/DCl dilution experiments support the spectral assignments and analysis. The identity of the counter anion [Cl ... (HCl)n] is discussed.