Effect of S1 Torsional Dynamics on the Time-Resolved Fluorescence Spectra of 9,9‘-Bianthryl in Solution
Time-resolved fluorescence spectra of 9,9‘-bianthryl (BA) were measured in methylcyclohexane (MCH) and a Decalin−isooctane (D−ISOO) mixture at several temperatures between 127 and 200 K. A suitable choice of the excitation wavelength makes it possible to observe a maximum manifestation of the S1 tor...
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| Published in: | The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 101; no. 11; pp. 2010 - 2015 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
American Chemical Society
13-03-1997
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| Online Access: | Get full text |
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| Summary: | Time-resolved fluorescence spectra of 9,9‘-bianthryl (BA) were measured in methylcyclohexane (MCH) and a Decalin−isooctane (D−ISOO) mixture at several temperatures between 127 and 200 K. A suitable choice of the excitation wavelength makes it possible to observe a maximum manifestation of the S1 torsional dynamics. A quantitative simulation of the time-resolved fluorescence spectra could be achieved based on the description of the torsional relaxation by a Smoluchowski equation. Besides, the band shape analysis enabled the determination of the effective S1 torsional potential as well as the temperature dependence of the friction coefficient related to the internal torsional motion. The friction coefficient ζ shows a power law dependence on the shear viscosity η, ζ ∝ η a , with a = 0.62. |
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| Bibliography: | Abstract published in Advance ACS Abstracts, February 15, 1997. istex:656B353116DD36E7DEFDA00C78F89B441BE192B0 ark:/67375/TPS-9VHWMV9S-C |
| ISSN: | 1089-5639 1520-5215 |
| DOI: | 10.1021/jp9639105 |