Isotropic 13C n.m.r. chemical shifts distinguish between tetramethylammonium ions trapped in the α and β cages of the zeolite A structure and are insensitive to Si:Al ratio; the observed intensities indicate near complete occupancy of the β cage over the complete composition range.
R. H. Jarman and M. T. Melchior, J. Chem. Soc., Chem. Commun., 1984, 414 DOI: 10.1039/C39840000414
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