Aggregation of cation-anionic and related polymethine dyes
Absorption, fluorescence, and fluorescence excitation spectra were studied for a number of cation-anionic and related anionic polymethine dyes in weakly polarand nonpolarsolvents, as well as in binary mixtures of solvents of different polarity. For some dyes, aggregation is observed in toluene or ac...
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| Format: | Article |
| Language: | English |
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Wiley
2000-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X00000039 |
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| author | A. S. Tatikolov G. Ponterini Zh. A. Krasnaya |
| author_facet | A. S. Tatikolov G. Ponterini Zh. A. Krasnaya |
| author_sort | A. S. Tatikolov |
| collection | DOAJ |
| description | Absorption, fluorescence, and fluorescence excitation spectra were studied for a number of
cation-anionic and related anionic polymethine dyes in weakly polarand nonpolarsolvents, as well as
in binary mixtures of solvents of different polarity. For some dyes, aggregation is observed in toluene or
acetonitrile-toluene mixtures with low amounts of acetonitrile, which is revealed as appearance of new absorption
bands and/or broadening of the initial bands of a monomeric dye. Solvent mixtures butyronitrilehexane
with low butyronitrile content were found to greatly stimulate the formation of dye aggregates for
most of the dyes studied. The absorption spectra of the aggregates are often blue-shifted with respect
to the corresponding absorption spectra of parent monomeric dyes and/or represent broad continuums
located both in the blue and red regions. For one of the cation-anionic dyes studied, which consists of
3,3′-diethylthiamonomethinecyanine cation and trimethinebenzoxanine anion, fluorescent aggregates were
observed; their broad fluorescence band is located in the long-wavelength region. For this dye, gradual transition
from nonfluorescent aggregates to fluorescent ones and then to monomeric ion pairs and dissociated
ions was observed in butyronitrile-hexane mixtures with growing butyronitrile content. |
| format | Article |
| id | doaj-art-3df853ac446643ccbc125e92c76dba5c |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2000-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-3df853ac446643ccbc125e92c76dba5c2025-02-03T01:24:02ZengWileyInternational Journal of Photoenergy1110-662X2000-01-0121172110.1155/S1110662X00000039Aggregation of cation-anionic and related polymethine dyesA. S. Tatikolov0G. Ponterini1Zh. A. Krasnaya2Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin Str. 4, Moscow 117977, RussiaDipartimento di Chimica, Universita di Modena, via Campi 183, Modena 41110, ItalyInstitute of Organic Chemistry, Russian Academy of Sciences, Leninsky Pr. 47, Moscow 117913, RussiaAbsorption, fluorescence, and fluorescence excitation spectra were studied for a number of cation-anionic and related anionic polymethine dyes in weakly polarand nonpolarsolvents, as well as in binary mixtures of solvents of different polarity. For some dyes, aggregation is observed in toluene or acetonitrile-toluene mixtures with low amounts of acetonitrile, which is revealed as appearance of new absorption bands and/or broadening of the initial bands of a monomeric dye. Solvent mixtures butyronitrilehexane with low butyronitrile content were found to greatly stimulate the formation of dye aggregates for most of the dyes studied. The absorption spectra of the aggregates are often blue-shifted with respect to the corresponding absorption spectra of parent monomeric dyes and/or represent broad continuums located both in the blue and red regions. For one of the cation-anionic dyes studied, which consists of 3,3′-diethylthiamonomethinecyanine cation and trimethinebenzoxanine anion, fluorescent aggregates were observed; their broad fluorescence band is located in the long-wavelength region. For this dye, gradual transition from nonfluorescent aggregates to fluorescent ones and then to monomeric ion pairs and dissociated ions was observed in butyronitrile-hexane mixtures with growing butyronitrile content.http://dx.doi.org/10.1155/S1110662X00000039 |
| spellingShingle | A. S. Tatikolov G. Ponterini Zh. A. Krasnaya Aggregation of cation-anionic and related polymethine dyes International Journal of Photoenergy |
| title | Aggregation of cation-anionic and related polymethine dyes |
| title_full | Aggregation of cation-anionic and related polymethine dyes |
| title_fullStr | Aggregation of cation-anionic and related polymethine dyes |
| title_full_unstemmed | Aggregation of cation-anionic and related polymethine dyes |
| title_short | Aggregation of cation-anionic and related polymethine dyes |
| title_sort | aggregation of cation anionic and related polymethine dyes |
| url | http://dx.doi.org/10.1155/S1110662X00000039 |
| work_keys_str_mv | AT astatikolov aggregationofcationanionicandrelatedpolymethinedyes AT gponterini aggregationofcationanionicandrelatedpolymethinedyes AT zhakrasnaya aggregationofcationanionicandrelatedpolymethinedyes |