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Raman ( 3 S 2 0 cm-') and IR (4000-80 cm-') spectra of benzophenone and a series of its puru-dkubstituted derivatives (substitoents F, C1, Br and CH,) as melts and in solution were recorded. A complete empirical a s s i p ment of tbe measured spectra was made and the influence of para substitution on tbe normal modes was investigated.

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Raman and infrared vibrational spectra have been recorded for o-pbthalic acid as a single crystal, as a powder and in solution. The proposed assignment of the observed frequencies was made on the basis of a normal coordinate analysis and symmetry considerations of the crystal spectrum, which allowed the separation of internal vibrations of the A and B species.