Optical spectroscopy on Se clusters and chains confined in zeolites.
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.
Goldbach
A
A
Centre de Recherche sur la Matiére Divisée (CRMD), UMR 6619 CNRS, Université d'Orléans, 1bis rue de la Férollerie, 45071, Orléans Cedex 2, France.
Saboungi
M-L
ML
D000327:Adsorption; D008422:Materials Testing; D008968:Molecular Conformation; D015394:Molecular Structure; D012643:Selenium / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman; D017641:Zeolites / Q000737:chemistry*
D017641:Zeolites; D012643:Selenium