Abstract
The infrared and Raman spectra of ethylenediamine hydrochloride, sulfate crystals, their N-deuterated compounds and ethylenediamine in the liquid and gaseous states and in cyclohexane solution were studied. The skeletal deformation vibration frequencies were found to be conformation sensitive and showed that the ethylenediamine molecule takes the trans and gauche forms in the liquid state and the gauche form in the gaseous state and in cyclohexane solution. The infrared and Raman spectra of monoethanolamine were studied in the liquid state. The spectra in the region for which the skeletal deformation vibration bands appear showed that the monoethanolamine molecule takes the trans and gauche form in the liquid state.
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