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Far-infrared spectra of benzoic acid

✍ Scribed by H.R. Zelsmann; Z. Mielke

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 592 KB
Volume: 186
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(91)90458-l

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✦ Synopsis

Crystalline benzoic acid has been studied by far-infrared spectroscopy in the spectral region of 20-230 cm-' with a view to a determination and an assignment of the pure lattice and the intermonomer vibrations. An anomalous behaviour, similar to the one found earlier in the mid-IR, is observed for the asymmetric O-H...0 stretching band with regard to the numberofcomponents of the band and its changes as a function of temperature and deuteration. The experiments were carried out for single crystals of fully hydrogenated benzoic acid (-he) with polarization analysis, and for powder samples of h6, d,, d5 and d, benzoic acid at temperatures between 6 and 295 K. An explanation of these anomalies is proposed.

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