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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 8
BKCSDE 32(8)
August 20, 2011 

The Concentration-Dependent Distribution of Tris(4,7'-diphenyl-1,10'- phenanthroline) Ruthenium (II) within Sol-Gel-Derived Thin Films
Joo-Woon Lee, Eun Jeong Cho*,
Ru(II) dopant, Sol-gel, Luminescence, Optical sensor
Organic dye-doped glasses, viz., ruthenium (II) tris(4,7'-diphenyl-1,10'-phenanthroline) [Ru(dpp)3]2+ incorporated into thin silica xerogel films produced by the sol-gel method, were prepared and their O2 quenching properties investigated as a function of the [Ru(dpp)3]2+ concentration (3-400 μM) within the xerogel. The ratio of the luminescence from the [Ru(dpp)3]2+-doped films in the presence of N2 and O2 (IN2/IO2) was used to describe the film sensitivity to O2 quenching. IN2/IO2 changed three-fold over the [Ru(dpp)3]2+ concentration range. Time-resolved intensity decay studies showed that there are two discrete [Ru(dpp)3]2+ populations within the xerogels (τ1 ~ 300 ns; τ2 ~ 3000 ns) whose relative fraction changes as the [Ru(dpp)3]2+ concentration changes. The increased O2 sensitivity that is observed at the higher [Ru(dpp)3]2+ concentrations is a manifestation of a greater fraction of the 3000 ns [Ru(dpp)3]2+ species (more susceptible to O2 quenching). A model is presented to describe the observed response characteristics resulting from [Ru(dpp)3]2+ distribution within the xerogel.
2765 - 2770
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