Vibrations de Basses Fréquences du Cristal de m‐Chloronitrobenzène

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Abstract
Polarized Raman and infrared spectra of meta‐chloronitrobenzene single crystals have been investigated in the ranges 140‐5 cm−1 and 140–20 cm−1 respectively. They are compared to those of meta‐bromonitrobenzene recorded for comparison. All 21 lattice vibrations expected have been observed and assigned to their symmetry species and in terms of translational and rotatory vibrations. The only intramolecular mode, a NO2 torsion, has been identified near 93 cm−1 giving rise to four components in the crystal. The corresponding potential barrier V2 = V*/4 has been calculated.