Abstract
Several polymeric silver clusters have been observed in Agx−NaA zeolite (x=1,6) of varying water content, which was exposed to x-rays at 77 K and annealed at higher temperatures.109Ag1−NaA zeolite dehydrated at 130°C yields the dimer109Ag2 + and the trimer109Ag3 2+ after irradiation at 77 K and annealing at 240 K. Owing to the use of one Ag isotope the EPR spectra of these species are highly resolved exhibitingg and hyperfine anisotropy. By irradiation of109Agx−NaA zeolite (x=1,6) in hydrated form two new trimeric silver clusters I and II are produced. The ratio between I and II depends on the initial Ag content. ESEEM spectra of these species show interaction with aluminum nuclei of the framework and with distant water molecules. If Ag6−NaA zeolite dehydrated at 130°C is irradiated the hexameric cluster Ag6 n+ is formed. The ESEEM spectrum shows interaction only to aluminum nuclei. From ESEEM experiments on Ag6 n+ with added adsorbates (D2O, CD3OD) it could be inferred that Ag6 n+ is only stable if the neighbouring cages do not contain adsorbate molecules.
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Michalik, J., van der Pol, A., Reijerse, E.J. et al. Paramagnetic silver species in irradiated Ag−NaA zeolites. An EPR and ESEEM study. Appl. Magn. Reson. 3, 19–35 (1992). https://doi.org/10.1007/BF03166778
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DOI: https://doi.org/10.1007/BF03166778