Raman phonon spectroscopic study of phase transition in o‐aminobenzoic acid crystal (II)

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AbstractRaman phonon spectroscopy in the 10–150 cm−1 shift range was used to study the phase transition in an o‐aminobenzoic acid crystal (II). At 77 K, twelve distinct phonon modes are observed whereas at 300 K the spectrum shows ten phonon bands. The temperature dependence of the phonon frequencies and band widths suggests that the crystal goes through a phase transition at ca. 200 K. The temperature dependence of the internal modes predicts that the phase transition is associated with some structural change in the phenyl ring.