Abstract
Far-infrared (far-IR) spectra of methyl-N-(1-naphthy1)-urethane (MU), ethy1-N-(1-naphthy1)-urethane (EU) and ethy1-N-phenylurethane (PhU) have been studied in the crystalline state and vibrational assignments have been made by referring to the normal coordinate analysis of the MU and the spectrum of its deuterium analogue with replacement of the NH proton by deuterium. The bands in the region 400–70 cm − 1 are assigned to skeletal vibrations of a urethane group. The bands in the region 250–140 cm − 1 are sensitive to temperature and dilution, which is due to the existence of torsional vibrations of urethane groups. The band at about 110 cm − 1 is assigned to the vibrations of the N–H⋯O bridge.
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