Abstract
In this section we describe, in some detail, work conducted on alkali-metal clusters in zeolites. Almost without exception, the clusters that we will discuss cannot exist in the gas-phase. As we shall demonstrate, the role of the zeolite is to provide an electrostatic containment field which gives rise to certain ionic sites within the zeolite Alkali-metal ions which, of course, play the role of counter-ion in the aluminosilicate zeolites, only take on the character of a cluster through introduction of an alkali atom or electron to the zeolite. Under these conditions, the electron (either the valence electron of the alkali atom or the introduced electron) is solvated by the electron trap afforded by these counter-ions. The ions relax around the electron and the result is an alkali-metal cluster. The concept is more than merely notional, since many of the physical properties (EPR and absorption cross-section) of the associated electron can be explained in terms of an alkali-metal cluster. Further, circumstantial evidence that the valence electron of an introduced alkali-atom is auto-ionized comes from the fact that XRD reveals that the nucleus takes up one of the ionic sites in the zeolite.
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Blake, N.P., Stucky, G.D. (1995). Alkali-Metal Clusters as Prototypes for Electron Solvation in Zeolites. In: Herron, N., Corbin, D.R. (eds) Inclusion Chemistry with Zeolites: Nanoscale Materials by Design. Topics in Inclusion Science, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0119-6_11
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DOI: https://doi.org/10.1007/978-94-011-0119-6_11
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