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

doi:10.1021/ja00055a028

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

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

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 language	English
Pages (from-to)	563-568
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	115
Issue number	2
DOIs	https://doi.org/10.1021/ja00055a028
State	Published - 1 Jan 1993
Externally published	Yes

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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@article{17168e1e7b6843a78738c4ecd164b5cc,

title = "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",

abstract = "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.",

author = "Raz Jelinek and Saim {\"o}zkar and Pastore, {Heloise O.} and Andrej Malek and Ozin, {Geoffrey A.}",

year = "1993",

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journal = "Journal of the American Chemical Society",

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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. / Jelinek, Raz; özkar, Saim; Pastore, Heloise O. et al.
In: Journal of the American Chemical Society, Vol. 115, No. 2, 01.01.1993, p. 563-568.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Guest-Host Interactions in Sodium Zeolite Y

T2 - Structural and Dynamical 23Na Double-Rotation NMR Study of H2O, PMe3, Mo(CO)6, and Mo(CO)4(PMe3)2 Adsorption in Na56Y

AU - Jelinek, Raz

AU - özkar, Saim

AU - Pastore, Heloise O.

AU - Malek, Andrej

AU - Ozin, Geoffrey A.

PY - 1993/1/1

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N2 - 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.

AB - 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.

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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

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