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  • Title: Optical spectroscopy on Se clusters and chains confined in zeolites.
    Author: Goldbach A, Saboungi ML.
    Journal: Eur Phys J E Soft Matter; 2003 Sep; 12(1):185-90. PubMed ID: 15007699.
    Abstract:
    The incorporation of selenium into the supercages of zeolite Y leads to the formation of Se(8) rings and distorted Se chains in a ratio which is influenced by the nature of the zeolitic cations. Here we review Raman (including resonance Raman) and UV/vis absorption spectroscopy results on Se encapsulated into a number of cation-exchanged faujasite zeolites. Both rings and chains give rise to characteristic Raman bands. In particular, low-frequency Raman bands are attributed to localized vibrations in ordered segments of distorted chains. The UV/vis absorption spectra indicate an opening of the band gap of selenium upon confinement in these zeolites. This can be reversed through electronic interaction with zeolite cations.
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