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Fluorescence of anthracene in frozen aqueous micellar solutions

✍ Scribed by Thomas Wolff; Susanne Weber; Günther Von Bünau

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
451 KB
Volume
52
Category
Article
ISSN
1010-6030

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✦ Synopsis

Excitation spectra of anthracene were recorded in the temperature range 80 -270 K in various frozen aqueous solutions containing the surfactants cetyltrimethylammonium halide CTAX (X = F, Cl, Br, I) or alkali dodecylsulphate MDS (M = Na, Cs). Fluorescence quantum yields (relative values) were obtained by integrating the area under the excitation spectra. A new, hitherto unobserved, emission was detected at temperatures above 250 K and was assigned to the formation of an anthracene-halide anion exciplex. It was most pronounced in the presence of fluoride and chloride anions. The existence of exciplexes under the given conditions is taken as evidence for the diffusion of species at temperatures well below the macroscopic melting point.

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