The energy difference between the rotational isomers of 1,1,2-trichloroethane has been determined in the gaseous and liquid states by the infrared absorption measurements. In the solid state, only one of the rotational isomers has been found to be stable. The different behavior in rotational isomerism between 1,1,2-trichloroethane and 2-methylbutane, both having the same skeletal configuration, has been explained in terms of the difference in the electrostatic part of the hindering potential.
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Kuratani et al. (1954) studied this question.
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