Abstract
Abstract The temperature broadening of the chlorine quadrupole resonance line-width was studied in three ethane derivatives (1, 1, 1-trichloroethane, hexachloroethane and 1, 1, 1, 2-tetrachloro-2, 2-dimethylethane) below the plastic crystalline phases. Most of the resonance frequencies observed at the temperature of liquid nitrogen were equal to those reported in the literature. The energies of activation (2.2, 2.6 and 4 kcal./mol. respectively for the three compounds mentioned above) were obtained from the line-width versus temperature curves in the low temperature phases. It was suggested, considering the smallness of the energies of activation, that the vibrational rotation of the molecule as a whole rather than the internal axial rotation may exist in those phases.
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