In this paper, the measurement of the energy difference between the rotational conformers of 1-2-diiodotetrafluoroethane by GC/FT-IR spectroscopy is demonstrated for the first time. The Δ<i>H</i>° obtained is lower than the value reported from the use of the neat vapor-phase method. The difference between the values may be attributed to solvent and adsorption effects.

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