Study of 1-naphthol as a fluorescent probe for the sol to gel to xerogel reaction of mixed aluminium and silicon systems

Autor:	Osamu Kawauchi, Nobuaki Negishi, Tsuneo Fujii, Toshiaki Mabuchi, Hiroshi Kitamura
Rok vydání:	1991
Předmět:	Silicon General Chemical Engineering Analytical chemistry General Physics and Astronomy chemistry.chemical_element General Chemistry Photochemistry Silane Fluorescence Catalysis Blueshift Tetraethyl orthosilicate chemistry.chemical_compound chemistry Aluminium Sol-gel
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 61:365-372
ISSN:	1010-6030
DOI:	10.1016/1010-6030(91)90019-p
Popis:	The fluorescence spectrum of 1-naphthol was observed, as a function of time, during the sol to gel to xerogel reaction of a mixed system composed of tetraethyl orthosilicate and diisobutoxyalumino triethoxy silane (silicon to aluminium ratio of approximately 9 : 1) catalysed by HCl. It was found that the fluorescence of 1-naphthol shifts to the red (predominant emission originating from the 1La state) in the first stage of the reaction. This red shift reflects the increase in the polar nature of the matrix surrounding the doped 1-naphthol molecules. In the next stage of the reaction, the spectrum shifts to the blue (predominant emission originating from the 1Lb state). This blue shift reflects the increase in the viscosity around the doped 1-naphthol molecules. The change in the fluorescence spectrum of 1-naphthol provides a sensitive means of probing the structural, chemical and physical characteristics which occur around the probe molecules during the sol-gel process.
Databáze:	OpenAIRE
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