Abstract
Over the past two decades electron paramagnetic resonance (EPR) has been used extensively in studies of the structure of transition metal ion exchanged zeolites. Use is made of the fact that data on g values and metal ion hyperfine splitting constants provide an insight into the structure of the cation binding site. In this contribution it will be shown that electron nuclear double resonance (ENDOR) makes it possible to measure the interactions between the unpaired electrons and nuclear spins in the vicinity of the paramagnetic cation. Generally, these interactions remain unresolved in the EPR spectra of these amorphous systems. The experimental results demonstrate that the ENDOR technique can be used to study cation solvation in the zeolite cavities and changes in cation environment induced by removal of solvent molecules or co-adsorbed molecules. It is shown that subtle structural changes that do not register in the EPR spectrum can have a profound effect of the ENDOR spectra. The results presented here suggest that ENDOR can be of great value in studies of transition metal ion adsorption on zeolites as well as other porous surfaces.
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