Abstract
The chemical properties of Disperse Red 1 (DR1), a dye molecule commonly used as an active guest of thin silica or ORMOSILs films for optical applications, were investigated by micro-Raman spectroscopy. The influence of the acid catalyst was studied in DR1 + TEOS (tetraethyl orthosilicate), DR1 + TEOS + GLYMO (3-glycidoxypropyltrimethoxysilane) and DR1 + TEOS + ICPTEOS [3-(triethoxysilyl)propyl isocyanate] sol–gel starting solutions and on the corresponding bulk glasses. A protonated form of DR1 was found in some glasses, and its Raman spectrum is reported. The protonation is not observed in GLYMO-based matrices owing to the protection against acid attack provided by the epoxy group. Copyright © 2000 John Wiley & Sons, Ltd.
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