Fluorescence quenching of 9,10-dicyanoanthracene by oxygen in liquid and supercritical carbon dioxide

The fluorescence quenching of 9,10-dicyanoanthracene (DCNA) by oxygen in liquid at 25°C and supercritical carbon dioxide (SCF CO 2) at 35°C was investigated at pressures from 8.0 to 60.0 MPa. The quenching rate constant, k q, increased significantly with increasing pressure in both the systems. The...

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Bibliographic Details
Published in:Chemical physics letters 2001-07, Vol.342 (5), p.578-582
Main Authors: Okamoto, Masami, Yamada, Keishi, Nagashima, Hiroaki, Tanaka, Fujio
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
Radiationless transitions, quenching
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Summary:The fluorescence quenching of 9,10-dicyanoanthracene (DCNA) by oxygen in liquid at 25°C and supercritical carbon dioxide (SCF CO 2) at 35°C was investigated at pressures from 8.0 to 60.0 MPa. The quenching rate constant, k q, increased significantly with increasing pressure in both the systems. The pressure dependence of k q in SCF CO 2 was satisfactorily interpreted in the same framework as the quenching mechanism in liquid phase that involves solvent cage.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(01)00600-5