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NMR Relaxation of quadrupolar Nuclei as a Probe of the Motion of Guest Species in Sodalite Cavities

Published online by Cambridge University Press:  15 February 2011

R. Jelinek  and
G. A. Ozin
R. Jelinek
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratories, and Department of Chemistry, University of California, Berkeley, CA 94720
G. A. Ozin
Affiliation:
Advanced Zeolite Materials Science Group, Lash Miller Chemical Laboratories, University of Toronto, Toronto, Ontario M5S-1A1, Canada
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Abstract

Useful information on interactions and motion of guest molecules in sodalite cavities is obtained by estimating the spin-lattice and spin-echo decay rates of encapsulated Br− ions. An extremely fast spin-lattice relaxation rate is observed for 81Br nuclei, adjacent to Br−-empty cages which contain rapidly tumbling water molecules. We detect a further significant different T1 of the 81Br in Na8Br2- sodalite and AgsBr2-sodalite, respectively, which probably indicates a less restricted motion within the cavities of the Ag+-exchanged material. Spin-echo decay experiments additionally indicate a difference between the dynamic properties of the Br− anion in the encapsulated Na4Br and Ag4Br clusters, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 290: Symposium N – Dynamics in Small Confining Systems , 1992 , 113
Copyright
Copyright © Materials Research Society 1993

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