Viscosity and temperature dependence of fluorescence lifetimes of anthracene and 9-methylanthracene

Blatt, Edward, Treloar, F. Edward, Ghiggino, Kennth P. and Gilbert, Robert G. (1981) Viscosity and temperature dependence of fluorescence lifetimes of anthracene and 9-methylanthracene. Journal of Physical Chemistry, 85 19: 2810-2816. doi:10.1021/j150619a022


Author Blatt, Edward
Treloar, F. Edward
Ghiggino, Kennth P.
Gilbert, Robert G.
Title Viscosity and temperature dependence of fluorescence lifetimes of anthracene and 9-methylanthracene
Journal name Journal of Physical Chemistry   Check publisher's open access policy
ISSN 0022-3654
1541-5740
Publication date 1981-09
Sub-type Article (original research)
DOI 10.1021/j150619a022
Volume 85
Issue 19
Start page 2810
End page 2816
Total pages 7
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
Time-correlated single-photon counting is used to determine the fluorescence lifetimes of anthracene and 9-methylanthracene over the temperature range 20-55°C as solutes in a variety of hydrocarbon solvents covering the viscosity range 0.3-200 cP (1 cP = 10-3 N s m-2). The absorption and emission spectra of both molecules show only small changes (e.g., 50 cm-1 shift in the absorption maxima) over this range of conditions. For anthracene, the fluorescence lifetime decreases with viscosity from a low viscosity limit; for 9-methylanthracene the fluorescence lifetime increases with viscosity and approaches a high viscosity limit. These results are quantitatively interpreted by a general kinetic scheme wherein rate coefficients are dominated by Franck-Condon factors in two types of coordinates: those of small groups such as H atoms where the dynamics are solvent independent, and those of larger groups where the rate is inversely proportional to the viscosity. The temperature dependence of the rate coefficients so obtained enables one to assign the spin multiplicity and energy of intersection (with the fluorescing state) of some of the states involved in the dynamics.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemistry and Molecular Biosciences
Centre for Nutrition and Food Sciences Publications
 
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Created: Mon, 07 Mar 2011, 15:37:40 EST