The Raman spectra of H—C![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
C—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.
A. L. Verma and H. J. Bernstein, J. Chem. Soc., Faraday Trans. 2, 1973, 69, 1586 DOI: 10.1039/F29736901586
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