Abstract
The infrared spectra of CH 3CONHCH 3 and CH 3CONDCH 3 have been investigated as low temperature crystals, pure liquids and solutions in various solvents in the 400-800 cm −1 range. A new assignment of the bands associated with the NH group is given. Multiplets of γ NH and γ ND fundamentals have generally been observed and have been interpreted in terms of a double minimum potential function of the γ NH mode with a tunnelling between two minima. The potential functions of γ NH and τ CN modes are similar and can be combined to give a potential surface with four minima corresponding to four molecular conformations. The influence of the hydrogen bonding on the γ NH splitting and barrier height is discussed.
Published Version
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