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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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
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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| Summary: | 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. |
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| ISSN: | 1110-662X |