Fluorescence quenching of phenanthrene and chrysene by potassium iodide in methanol-ethanol solutions

The fluorescence decay functions and the fluorescence quantum yields of phenanthrene-h 10, -d 10, chrysene-h 12 and -d 12 in the presence of Kl in methanol-ethanol solutions were measured at 77 K and 293 K. The fluorescence decay functions measured at 77 K were analyzed taking into account the dista...

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Bibliographic Details
Published in:Journal of luminescence 1987-06, Vol.37 (3), p.139-147
Main Authors: Mac, Marek, Jarzȩba, Włodzimierz, Najbar, Jan
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Fluorescence and phosphorescence
radiationless transitions, quenching (intersystem crossing, internal conversion)
Molecular properties and interactions with photons
Physics
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Summary:The fluorescence decay functions and the fluorescence quantum yields of phenanthrene-h 10, -d 10, chrysene-h 12 and -d 12 in the presence of Kl in methanol-ethanol solutions were measured at 77 K and 293 K. The fluorescence decay functions measured at 77 K were analyzed taking into account the distance dependence of the intersystem crossing and radiative fluorescence rate constants. The kinetic effects and spectral evidence suggest that for the external heavy-atom effect in the system investigated here both the electron transfer processes and the exciplex formation between the aromatic molecule and perturber are important.
ISSN:0022-2313
1872-7883
DOI:10.1016/0022-2313(87)90187-6