Longitudinal n.m.r. relaxation of aluminium-27 in zeolites is governed by quadrupole interactions with adsorbed polar molecules and exchangeable cations
Abstract
Longitudinal relaxation times of 27Al in zeolite frameworks are between ca. 0.3 and 70 ms and are governed by quadrupole interactions with polar sorbates and cations; dipolar interactions with guest molecules and paramagnetic impurities are normally insignificant.