Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cation
The fluorescence spectrum of N-(1-anthryl)-2,4,6-trimethylpyridinium cation (1) has an anomalously high Stokes' shift. The fluorescence spectra of 1 in ethanol and butyronitrile are shifted to shortwavelength region and fluorescence quantum yield increases as the temperature decreases. The fluo...
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| Format: | Article |
| Language: | English |
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Wiley
2004-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X04000108 |
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| author | M. N. Khimich N. I. Makarova M. I. Knyazhansky B. M. Uzhinov |
| author_facet | M. N. Khimich N. I. Makarova M. I. Knyazhansky B. M. Uzhinov |
| author_sort | M. N. Khimich |
| collection | DOAJ |
| description | The fluorescence spectrum of N-(1-anthryl)-2,4,6-trimethylpyridinium cation (1) has an anomalously
high Stokes' shift. The fluorescence spectra of 1 in ethanol and butyronitrile are shifted to shortwavelength
region and fluorescence quantum yield increases as the temperature decreases. The fluorescence
rate constant of this compound changes considerably (6 times in ethanol and 15 times in butyronitrile) as
the temperature decreases from 293 K (relaxed state) to 77 K (mainly nonrelaxed state). It points out that at
these temperatures the fluorescence takes place from two species with different structures. It is concluded
that anomalously high fluorescence Stokes' shift of 1 is caused by both solvent orientation relaxation and
excited state structural relaxation consisting in the mutual rotation of anthracene and pyridinium fragments
of the cation and resulting in the formation of a specie with different structure. The rates of these processes
are determined by the temperature-dependent viscosity of the medium. |
| format | Article |
| id | doaj-art-d816c90f3fb448e082e14391668baae9 |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2004-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-d816c90f3fb448e082e14391668baae92025-02-03T01:11:25ZengWileyInternational Journal of Photoenergy1110-662X2004-01-0162697210.1155/S1110662X04000108Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cationM. N. Khimich0N. I. Makarova1M. I. Knyazhansky2B. M. Uzhinov3Department of Chemistry, M.V. Lomonosov Moscow State University, Vorob'evy Gory, Moscow 119899, RussiaInstitute of Physical and Organic Chemistry, Rostov State University, Stachki str. 194/3, Rostov on Don 344104, RussiaInstitute of Physical and Organic Chemistry, Rostov State University, Stachki str. 194/3, Rostov on Don 344104, RussiaDepartment of Chemistry, M.V. Lomonosov Moscow State University, Vorob'evy Gory, Moscow 119899, RussiaThe fluorescence spectrum of N-(1-anthryl)-2,4,6-trimethylpyridinium cation (1) has an anomalously high Stokes' shift. The fluorescence spectra of 1 in ethanol and butyronitrile are shifted to shortwavelength region and fluorescence quantum yield increases as the temperature decreases. The fluorescence rate constant of this compound changes considerably (6 times in ethanol and 15 times in butyronitrile) as the temperature decreases from 293 K (relaxed state) to 77 K (mainly nonrelaxed state). It points out that at these temperatures the fluorescence takes place from two species with different structures. It is concluded that anomalously high fluorescence Stokes' shift of 1 is caused by both solvent orientation relaxation and excited state structural relaxation consisting in the mutual rotation of anthracene and pyridinium fragments of the cation and resulting in the formation of a specie with different structure. The rates of these processes are determined by the temperature-dependent viscosity of the medium.http://dx.doi.org/10.1155/S1110662X04000108 |
| spellingShingle | M. N. Khimich N. I. Makarova M. I. Knyazhansky B. M. Uzhinov Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cation International Journal of Photoenergy |
| title | Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cation |
| title_full | Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cation |
| title_fullStr | Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cation |
| title_full_unstemmed | Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cation |
| title_short | Excited state structural relaxation relaxation of N-(1-anthryl)-2,4,6-trimethyl-pyridinium cation |
| title_sort | excited state structural relaxation relaxation of n 1 anthryl 2 4 6 trimethyl pyridinium cation |
| url | http://dx.doi.org/10.1155/S1110662X04000108 |
| work_keys_str_mv | AT mnkhimich excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation AT nimakarova excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation AT miknyazhansky excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation AT bmuzhinov excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation |