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Akimov, A. I.; Kovaleva, I. V.; Levshin, L. V.; Салецкий, А. М.

doi:10.1023/a:1013225429350

Journal of Applied Spectroscopy

2001

DOI: 10.1023/a:1013225429350

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A. I. Akimov

I. V. Kovaleva

L. V. Levshin

et al.

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Cited by 3 publications

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“…Complexes in the ground state (associates) that are associated states causing a change of the laser active medium spectral characteristics and also fluorescence quenching can be formed at high dye concentrations. The efficiency of association processes in polymeric systems with incorporated dye molecules depends on their structural organization and charges [4]. Association processes between various types of molecules (formation of heterogeneous associates) are interesting with respect to the use of multi-component luminescing systems for increasing the lasing energy and expanding the frequency range of its tuning.…”

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Absorption spectra of associates of heterogeneous dye molecules in polymer matrices

2011

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The formation processes for heterogeneous associates of cationic dyes in polyvinyl alcohol films are investigated. The influence of colorless anions on the heterogeneous association efficiency is established. The structures of heterogeneous dimers of various dyes in polymer matrixes are defined.Introduction. Polymeric laser elements that are both solutions of dyes [1] and polymeric matrices with incorporated molecules [2, 3] have recently become of great interest. The generating properties of such media are determined mainly by their spectral and luminescent characteristics. Complexes in the ground state (associates) that are associated states causing a change of the laser active medium spectral characteristics and also fluorescence quenching can be formed at high dye concentrations. The efficiency of association processes in polymeric systems with incorporated dye molecules depends on their structural organization and charges [4]. Association processes between various types of molecules (formation of heterogeneous associates) are interesting with respect to the use of multi-component luminescing systems for increasing the lasing energy and expanding the frequency range of its tuning. The interaction of only colored ions (cations) is usually examined in studies of formation processes of heterogeneous associates of dyes [5,6]. Therefore, an investigation of the influence of colorless anions on such processes is critical. Herein we report results from a study of association processes of dye molecules in polymeric matrices.Experimental. The following cationic dyes were studied: Rhodamine 6G (R6G) with various anions (Cl

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Absorption spectra of associates of heterogeneous dye molecules in polymer matrices

2011

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“…In view of the fact that the association processes were investigated in the region of concentrations of the dye at which simple associates (dimers) are formed, the angle ϕ between the dye molecules forming these associates may serve as its characteristic. The angle ϕ between the planes of the associated molecules can be calculated from the formula [9] µ sh…”

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Influence of microwave radiation on the association processes of rhodamine 6G molecules in aqueous solutions

et al. 2005

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UDC 532. 74:547.97 The influence of the microwave radiation of two frequency ranges (2.0 mm and 6.9 dm) on the absorption spectra of the cationic dye rhodamine 6G has been investigated. A reversible decrease in the quantity of the dimers of the dye molecules after exposure of its aqueous solution to microwave radiation and also the phenomenon of destruction of the associates of the dye molecules under the influence of the microwave field have been revealed. They are discussed from the standpoint of the structural characteristic features of water.Introduction. Investigation of the influence of low-intensity microwave radiation on the structural characteristic features of aqueous systems has been of interest to specialists in the fields of biology and medicine for many years. This is associated with the attempts at explaining the influence of external fields on real biological systems and live tissues via a change in the structure of water, which is an indispensable component of the biological world.The main contemporary experimental and theoretical works devoted to the study of the influence of microwave radiation on aqueous systems have been considered in rather great detail in [1][2][3][4]. Attempts have also been made in these works to explain the effect of microwave radiation on water on the basis of models and investigation of the change in the spectral properties of water and results effect of the microwave field on natural objects. Earlier [5], another method of registration of the interaction of microwave radiation with a substance -the molecular-probe method -was suggested. A change in the optical properties of the aqueous solution of protein and of the cationic dye rhodamine 6G (R6G) upon exposure to the microwave field in the region of wavelengths of about 3 cm was revealed. In the works cited, these effects are attributed to several possible reasons: a change in the probability of proton transfer along the hydrogen bond, ionic and orientation defects of the water structure, and the appearance of long-lived metastable states under the influence of electromagnetic waves. However, all these are at the level of assumptions and unchecked theories, which is due, in our opinion, to the insufficient experimental base in this area.The aim of the present work is to investigate the influence of microwave radiation of two different frequency ranges -millimeter and decimeter ones -on the effectiveness of the association processes of the dye molecules dissolved in water.Experimental. The absorption spectra were measured on an automated Lambda-35 (Perkin Elmer) spectrophotometer. The error of measurements of the optical density was 0.0005 rel. units. The object of investigation was the dye R6G. Bidistilled water was used for preparing solutions. The concentration of R6G was 3⋅10 −4 mole/liter. The treatment of aqueous solutions was made with the aid of a "Khronos" electromagnetic activator. Irradiation was effected at two wavelengths: 2.0 mm and 6.9 dm. The time of irradiation varied from 10 to 60 min. Irradiation...

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“…Dependence of the relative quantum yield of fluorescence of R6G on its concentration for systems with ordered (1-3) and unordered (4, 5) arrangement of charged segments at one and the same ratio between the different-sign charges (1, 4) and at a 60% excess of positively(2,5) and negatively charged segments(3).…”

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Influence of the Microstructure of Polymer Gels on the Electron-Excitation Energy Transfer Between Organic Molecules

et al. 2005

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The electron-excitation energy transfer (EEET) between ionic dyes in polyelectrolyte-network polymers with a different space distribution of charged segments has been investigated. It has been established that the structure of network polymers influences the efficiency of the EEET in them mainly due to the formation of a fractal distribution of interacting molecules. It is shown that the efficiency of the EEET can be controlled by changing the number and arrangement of charged segments of polyelectrolyte networks.

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Cited by 3 publications

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Absorption spectra of associates of heterogeneous dye molecules in polymer matrices

Absorption spectra of associates of heterogeneous dye molecules in polymer matrices

Influence of microwave radiation on the association processes of rhodamine 6G molecules in aqueous solutions

Influence of the Microstructure of Polymer Gels on the Electron-Excitation Energy Transfer Between Organic Molecules

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