Abstract
The 23Na MAS and double rotation (DOR) NMR spectra of dehydrated zeolite NaY loaded with two molecules of Mo(CO)6 per supercage show three components distinguished by the corresponding quadrupole coupling constants (QCC). Sodium cations in the hexagonal prisms (SI sites) are characterized by a narrow Gaussian line with a QCC value close to zero. A second component with quadrupole coupling constants between 4.4 and 4.8 MHz is assigned to Na+ cations located in the sodalite cages, and the third component with QCC ranging between 2.2 and 2.8 MHz is due to sodium cations in the supercages interacting with Mo(CO)6. These sites are characterized by structural and/or dynamical disorder as observed by typical line shape properties. Adsorption of Mo(CO)6 in Y zeolites, where all Na+ cations in the supercages of NaY have been exchanged with NH4+ or H+, causes the sodium cations in the sodalite cages to migrate into the supercages in order to interact with the adsorbent. For the NH4+-exchanged sample, the anisotropi...
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