Probing the chemical environment at the porous cage of ormosils through the fluorescence of oxazine 1

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Abstract
Ormosils (organically modified silicates) were prepared by the sol–gel process through the incorporation of non-ionic surfactants in the starting solution. Oxazine 1 was used as the fluorescent probe for the achievement of this study. Thus, recording of the absorption and emission fluorescence spectra, as well as measurement of the fluorescence lifetimes of oxazine 1, enabled us to determine the allocation of organic molecules within the porosity of silica gel-glasses. Furthermore, the reorientational correlation times of the fluorescent probe have been obtained through fluorescence anisotropy. According to the microviscosity data calculated from the fluorescent anisotropy measurements, movement of oxazine 1 is more restricted in the porous cage of ormosils than it is in silica gel-glasses.

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