Abstract
1H NMR spectra of molecules sorbed in porous materials may be strongly influenced by the presence of local magnetic fields due to susceptibility broadening which is a result of the polarization of the adsorbent grains in particular in strong magnetic fields. The linewidth can be essentially reduced by the application of magic angle spinning (MAS) techniques but is also determined by the translational motion of the adsorbed species over mean distances which are comparable to the dimensions of the grains. The lineshape analysis was performed on the basis of a modified Anderson–Weiss theory as proposed by Fenzke etal. and compared with 1H NMR spectra measured for butene molecules sorbed in NaX-type zeolites at various external fields B (up to 17.6. T) and different MAS frequencies. A considerable gain in resolution of the chemical shifts by using high magnetic fields is established. Copyright © 2000 John Wiley & Sons, Ltd.
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