NMR Studies of7Li,23Na, and27Al in Yhyphen;Faujasite

摘要

NMR methods were used to study specific atom environment and distribution in Yhyphen;faujasite. The widths of the27Al and23Na signal in the hydrate were dominated by secondhyphen;order quadrupolar effects; they were not observable in the dehydrated material. The exchange of lithium for sodium and the subsequent observation of the7Li NMR in the dehydrated Yhyphen;faujasite provided a convenient structural probe and permitted a comparison of the experimental and theoretical second moments, the latter being based upon the cation distribution known for the sodium form from xhyphen;ray diffraction data. Magnetic dipolar broadening dominates the linebreadth of the7Li resonance.