Abstract
Abstract The infrared dichroism of CH3CONHCOCH3, CD3CONHCOCD3 and their N-deuterated compounds in the stable crystalline form, in which the molecules take trans-cis conformation, have been investigated in the region 4000 to 400 cm−1. Vibrational assignments have been made on the basis of isotope shifts and infrared dichroism. Normal coordinate treatment has been made for the out-of-plane (a'') vibrations of the trans-cis planar model. From the torsional force constants about the C-N bonds, the potential barrier for the internal rotation about the C-N bond was estimated to be 27 kcal mol .
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