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

✍ Scribed by Subhasis Chakrabarti; Uttam K. Sarkar; T. N. Misra

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 276 KB
Volume: 22
Category: Article
ISSN: 0377-0486
DOI: 10.1002/jrs.1250220710

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✦ Synopsis

Abstract

Raman 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.

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