Abstract
Abstract The reorientational correlation times of phenyl groups in 2,4-diphenylpentane in solution were measured as a function of the temperature by means of Raman line-shape analysis. The reorientational correlation times of both isomers increase as the temperature increases, that is, the reorientational motion of phenyl groups in molecules gradually become active. In the low-temperature region, the reorientational correlation times of the meso 2,4-diphenylpentane are longer than those of the racemic one. This fact that the molecular motion of phenyl groups of the racemic isomer rotates more easily than that of the meso one is in agreement with the results obtained from ultrasonic study by Monnerie et al. On the other hand, in the higher-temperature region, the reorientational correlation times of the meso isomer are shorter than those of the racemic one. In addition, the potential barriers for the reorientational motion of phenyl groups are found to be (3.3±0.3) kcal/mol for the meso isomer and (2.0±0.3) kcal/mol for the racemic isomer.
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