Abstract
Fourier Transform IR spectra of p-terphenyl have been recorded from 4000 to 400 cm − both in the low temperature (LT) and high-temperature (HT) crystalline phases, as well as in solution and in the molten state. IR spectra between 450 and 300 cm −1 have also been investigated in the HT crystalline phase and in solution. In addition, the Raman spectrum of the HT crystalline phase and polarized Raman spectra of solution and melt have been recorded. First, the effect of disorder in the HT crystalline phase is discussed. Then, the spectral differences observed between solid and liquid states are interpreted in terms of conformational changes. Comparison of group theory predictions with experimental results indicates that p-terphenyl belongs to the C 2 symmetry in solution and in the melt.
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