Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 23, Issue 3, Pages 215-220Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1013966629311
Keywords
ORMOSIL; electrochemiluminescence; diffusion; microelectrode; sol-gel
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The diffusivity and reactivity of Ru(bpy)(3)(2+) and Co(bpy)(3)(2+) trapped within organically modified silicate (ORMOSIL) monoliths have been studied using electrogenerated chemiluminescence, voltammetry, and amperometry. For gel-encapsulated Ru(bpy)(3)(2+)-tripropylamine, the shape and intensity of the luminescence-voltage curve was highly dependent on the amount of organoalkoxysilane introduced into the matrix. Likewise, for gel-encapsulated Co(bpy)(3)(2+), the magnitude of the diffusion coefficient and its rate of change with drying was also dependent on the organic modifier in the gel. A comparison of the results to those obtained with the gels prepared solely from tetramethoxysilane revealed enhanced diffusivity and reactivity of the reagents encapsulated in the ORMOSIL matrix.
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