The line shape of solid-state 139La NMR spectra is sensitive to the local symmetry of the La ion sites: investigation of calcined La-exchanged Y zeolites reveals sharp and broad signals corresponding to La ions located in supercages and in small cages, respectively.
B. Herreros, P. P. Man, J. Manoli and J. Fraissard, J. Chem. Soc., Chem. Commun., 1992, 464 DOI: 10.1039/C39920000464
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