Infrared Investigation of Fluoride Occluded in Double Four-Member Rings in Zeolites
The Journal of Physical Chemistry B2002Vol. 106(10), pp. 2796–2800
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Abstract
Three infrared absorption bands related to fluoride occluded within double four-member ring units of zeolites exist: one corresponds to fluoride itself and the other two are localized vibrations of the cage appearing at a different wavenumber depending on the presence or absence of fluoride within the cage. This is demonstrated by comparison of the vibrational spectra of a series of as-made and calcined octadecasil materials containing varying degrees of fluoride and aluminum and is further supported by ab initio quantum chemical calculations.
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