The presence of Pr4N+ templates causes an increase of Tl for 29Si nuclei in ZSM-5 zeolites of more than one order of magnitude, and relatively small changes in zeolite structure are important; due care is required in extracting quantitative data from 29Si magic angle spinning n.m.r. spectra of zeolites.
L. J. M. van de Ven, J. G. Post, J. H. C. van Hooff and J. W. de Haan, J. Chem. Soc., Chem. Commun., 1985, 214 DOI: 10.1039/C39850000214
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