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Rotational isomerism in propargyl amine studied by Raman spectroscopy

The Raman spectra of H—CC—CH2—NH2 and D—C C—CH2—ND2 reveal the presence of two rotational isomers for which the enthalpy difference of 1024 ± 40 cal mol–1(4280 ± 160 J mol–1) has been obtained in the liquid phase. Attempts to measure ΔH in the vapour phase were unsuccessful due to the decomposition of the compound. The N-lone-pair-trans conformation has been shown to be the lower energy form.