Guest-Host Interactions in Sodium Zeolite Y: Structural and Dynamical 23Na Double-Rotation NMR Study of H2O, PMe3, Mo(CO)6, and Mo(CO)4(PMe3)2 Adsorption in Na56Y

Raz Jelinek, Saim özkar, Heloise O. Pastore, Andrej Malek, Geoffrey A. Ozin

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23Na double-rotation NMR (DOR) provides site-specific structural and dynamical information on guest-host interactions within sodium zeolite Y pores. Quantitative adsorption of H2O, PMe3, and Mo(CO)6 guests affects both the positions and line shapes of the 23Na resonances from specific extraframework Na+ sites. The evolution of the 23Na DOR spectra with the progressive introduction of guest molecules allows one to probe direct “solvation” effects involving the Na+ cations in the larger supercages, as well as indirect effects on the Na+ cations in adjacent smaller sodalite cavities. 23Na DOR experiments conducted at two magnetic field strengths confirm that PMe3 coadsorption in 8{Mo(CO)6},16{PMe3}-Na56Y, and PMe3 ligand-substitution in 8{cis-Mo(CO)4(PMe3)2]-Na56Y give rise to progressive deshielding and enhanced quadrupolar interactions of the anchoring Na+ cations in the α-cages, relative to those of the starting material, 8{Mo(CO)6}−Na56Y. Spin-lattice relaxation measurements indicate that adsorption of PMe3 facilitates an increased motion of the Na+ cations and/or guest species inside the α-cages.

Original languageEnglish
Pages (from-to)563-568
Number of pages6
JournalJournal of the American Chemical Society
Issue number2
StatePublished - 1 Jan 1993
Externally publishedYes


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