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...

Full description

Bibliographic Details
Main Authors: M. N. Khimich, N. I. Makarova, M. I. Knyazhansky, B. M. Uzhinov
Format: Article
Language:English
Published: Hindawi Limited 2004-01-01
Series:International Journal of Photoenergy
Online Access:http://dx.doi.org/10.1155/S1110662X04000108
id doaj-d816c90f3fb448e082e14391668baae9
record_format Article
spelling doaj-d816c90f3fb448e082e14391668baae92020-11-24T20:46:04ZengHindawi LimitedInternational 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
collection DOAJ
language English
format Article
sources DOAJ
author M. N. Khimich
N. I. Makarova
M. I. Knyazhansky
B. M. Uzhinov
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
author_facet M. N. Khimich
N. I. Makarova
M. I. Knyazhansky
B. M. Uzhinov
author_sort M. N. Khimich
title 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_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_sort excited state structural relaxation relaxation of n-(1-anthryl)-2,4,6-trimethyl-pyridinium cation
publisher Hindawi Limited
series International Journal of Photoenergy
issn 1110-662X
publishDate 2004-01-01
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.
url http://dx.doi.org/10.1155/S1110662X04000108
work_keys_str_mv AT mnkhimich excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation
AT nimakarova excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation
AT miknyazhansky excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation
AT bmuzhinov excitedstatestructuralrelaxationrelaxationofn1anthryl246trimethylpyridiniumcation
_version_ 1716813241478283264