| Popis: |
Containment of organic species within microporous materials such as zeolites influences their modes of molecular motion. This manifests itself in a range of ways, including a reduction in the volume that is readily accessible to the molecules by translation, constraints upon the molecular conformational space, restricted modes of molecular reorientation, or altered vibrational frequencies. The perspectives on certain of the motional properties of sorbates and of tetramethylammonium cations within zeolites provided by simple molecular modelling, neutron powder diffraction, 13C and 2H(D) NMR, and inelastic and quasielastic neutron scattering are outlined and illustrated by selected recent results. |
