Abstract
A band analysis of the IR spectra of CH3OH and CH3OD in 1,4-dioxane and tetrahydrofurane in the first overtone region was performed in order to resolve the overlapping subbands. The results show a splitting of the OH and OD stretching vibrations into a band caused by the pure overtone vibration and a second band which can be described as a combination of the overtone vibration with the O…O vibration of the H-bond complex. From the obtained frequencies of the band maxima it follows the the anharmonicity constants of the H-bond complexes increase in comparison to the anharmonicity constant of the OH or OD groups in the gas phase. The band splitting of the two bands is nearly unchanged by deuteration and the isotopic frequency ratio of the O…O band is smaller than that of the OH/OD vibrations.
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