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Rotational dynamics of quinizarin in silicate and aluminosilicate solutions, gels, and glasses

✍ Scribed by Drew L'Espérance; Eric L. Chronister

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
601 KB
Volume
201
Category
Article
ISSN
0009-2614

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✦ Synopsis

Time-resolved fluorescence depolarization measurements are used to probe chromophore orientational dynamics in aluminosilicate and silicate solutions, gels, and porous xerogel glasses. Since orientational chromophore dynamics depend on the local viscosity, these measurements are used to probe the local chromophore environment along the solution/gel/xerogel transition.

The ability of quinizarin to complex aluminum leads to different chromophore rotational dynamics in the silicate and aluminosilicate solutions and gels. However, we observe little chromophore orientational motion in either of the xerogel glasses, on a timescale of the fluorescence lifetime.

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