Abstract
Abstract Gas-phase vibrational spectra of bipbenyl and nitrobenzene have been examined by Raman spectroscopy. In both cases, the (Δv = 2) overtone of the torsional mode has been observed. For nitrobenzene, the potential function governing internal rotation was represented by a periodic potential function of the form V(φ) = V 2 (1— cos 2φ) 2 . The observed torsional frequency and the dihedral angle deduced from a gas phase electron diffraction analysis for biphenyl were used to determine its torsional potential function. The calculated barriers to internal rotation are compared with those determined previously for structurally similar molecules.
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