The first highly-resolved 19F n.m.r. spectra in the gas-phase have been observed for 1,2-difluoroethane, and the conformational energy difference between the gauche and trans states has been estimated to be about –0.8 kcal/mol (1 kcal = 4.184 kJ) from the coupling constants observed in the 19F and 1H n.m.r. spectra.
T. Hirano, S. Nonoyama, T. Miyajima, Y. Kurita, T. Kawamura and H. Sato, J. Chem. Soc., Chem. Commun., 1986, 606 DOI: 10.1039/C39860000606
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