SCHEDULED MAINTENANCE
Vibrational band contours. Part 1.—The hexafluorobenzene–benzene system
Abstract
Interactions between benzene and hexafluorobenzene lead to a frequency shift and a broadening of the band arising from the out-of-plane CF bending vibration (a2u species). It is deduced that the intermolecular interactions are short lived, stochastic, are not simple polar interactions and that the resulting forces are directed perpendicular to the ring plane. This is based on symmetry considerations and on the concentration dependence and magnitudes of the frequency shifts and of the Fourier transforms of the absorption band contours. Assuming that vibrational relaxation occurs through dissociation of the complex with 100% efficiency, leads to lower limits for the rate constants for complex formation and dissociation. There are still a number of outstanding problems of interpretation.
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