Abstract

Inelastic neutron scattering has been used to study molecular tunnelling and intramolecular vibrational modes in several inclusion complexes of calixarenes. In methyl-containing guest molecules the free rotor limit is approached, and the splitting of the librational modes appears to be very sensitive to the details of the particle motion. The experimental spectra are interpreted in the framework of different models, and the potential barriers obtained are compared with molecular mechanics calculations.

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