Abstract
Abstract The infrared spectra of CH3CONHCOCH3, CD3CONHCOCH3, CD3CONHCOCD3, and their N-deuterated compounds have been recorded for the unstable crystalline modification in which the molecules are in the trans-trans conformation (form B). The Raman spectra of CH3CONHCOCH3 in the form B crystal and in the complex with KI have also been recorded. Vibrational assignments have been given by referring to the characteristic group frequencies of related compounds, the infrared dichroic measurement for CH3CONHCOCH3 and the isotopic frequency shifts. The normal coordinates analysis has been made by assuning the planar trans-trans conformation of the –CONHCO– (–CONDCO–) group. The calculated frequencies fit to the observed satisfactorily.
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