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Multinuclear solid‐state NMR study of cadmium‐ and lead‐exchanged LTA zeolites
Author(s) -
Eldewik Abdussallam,
Hook James M.,
Singh Nagindar K.,
Howe Russell F.
Publication year - 1999
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199912)37:13<s63::aid-mrc563>3.0.co;2-n
Subject(s) - chemistry , cadmium , solid state nuclear magnetic resonance , lead (geology) , solid state , organic chemistry , nuclear magnetic resonance , physics , geomorphology , geology
This paper describes 29 Si, 27 Al, 207 Pb and 113 Cd NMR studies of Pb‐ and Cd‐exchanged LTA zeolites. The 113 Cd NMR spectra identify for the first time two different coordination states for Cd 2+ in hydrated CdLTA, consistent with x‐ray single crystal diffraction data for this zeolite. The effects of Cd 2+ exchange on the 29 Si NMR spectra of LTA are also consistent with the structural data. Cd 2+ exchange perturbs the 27 Al NMR spectrum of the zeolite, as does Pb 2+ exchange. Changes in the 29 Si NMR spectra on Pb 2+ exchange are explained in terms of structural distortion of the framework. 207 Pb NMR spectra of Pb 2+ exchanged LTA show a single broad signal indicating that Pb 2+ cations are rigidly located in the zeolite at relatively long Pb O distances in the hydrated zeolites. Copyright © 1999 John Wiley & Sons, Ltd.