Free to rotate: The rotational spectrum of unlabeled and 13C-labeled benzene species reveals that the benzene–trifluoromethane complex is stabilized by a CH⋅⋅⋅π weak hydrogen bond and undergoes an almost-free rotation of the two subunits with respect to each other (see picture). The estimated dissociation energy is 8.4 kJ mol−1.
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López et al. (2005) studied this question.
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