Inelastic neutron scattering has been used to study molecular tunnelling in the p-tert-butylcalix[4]arene(2:1)p-xylene complex. At low temperature the measured spectra show several bands between 0.63 and 2.6 meV which are interpreted as being due to transitions between tunnel-split librational states of the p-xylene methyl groups. Effects of coupling between a CH3 group and the whole p-xylene molecule have been observed. The rotational barrier provided by the host lattice is very small and the methyl groups behave as almost free quantum rotors.
Molecular Tunnelling in p-tert-butylcalix[4]arene(2:1)p-xylene / M., Prager; Caciuffo, ROBERTO GIOVANNI MARIA; G., Amoretti; C. J., Carlile; G., Coddens; F., Fillaux; Francescangeli, Oriano; F., Ugozzoli. - In: MOLECULAR PHYSICS. - ISSN 0026-8976. - 81 (3):(1994), pp. 609-619. [10.1080/00268979400100411]
Molecular Tunnelling in p-tert-butylcalix[4]arene(2:1)p-xylene
CACIUFFO, ROBERTO GIOVANNI MARIA;FRANCESCANGELI, ORIANO;
1994-01-01
Abstract
Inelastic neutron scattering has been used to study molecular tunnelling in the p-tert-butylcalix[4]arene(2:1)p-xylene complex. At low temperature the measured spectra show several bands between 0.63 and 2.6 meV which are interpreted as being due to transitions between tunnel-split librational states of the p-xylene methyl groups. Effects of coupling between a CH3 group and the whole p-xylene molecule have been observed. The rotational barrier provided by the host lattice is very small and the methyl groups behave as almost free quantum rotors.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
