  Our published and new experimental results by means of deuteron NMR
spectroscopy in studies of molecular mobility in confinement are summarized and
annalysed. Conclusions about limits of applicability of methods in disclosing
several features are achieved. A set of molecules: D2, CD4, D2O, ND3, CD3OD and
(CD3)2CO was chosen and introduced into zeolites with faujasite structure.
Measurements of deuteron spectra and relaxation in function of loading and
temperature provide a wealth of cases. A tranistion from translational into
rotational mobility on decreasing temperature was a common obsevation. Fast
magnetization exchange between two subsystems with different mobility was
considered as a model. Existence of D2O clusters and trimers of CD3OD was a
particularly significant evidence for importance of mutual ineractions.
Evolution of spectral components, derivation of the activation energy and T1/T2
ratio are among analysed features. Choice of the zeolite, eg. NaY or NaX,
introduces specific inertactions with the zeolite framework. Temperature at
wich molecules become immobilized on cage walls is related to the strength of
the interactions. On increasing temperature we may observe features like for
layers of liquid on cage walls and gaseus state. In general properly chosen
molecules may be used for characterization of host microporous systems.
