Dependence of the luminescence and generation properties of solutions of polymethine dyes on their structure

Mostovnikov, V. A.; Рубинов, А. Н.; Alperovich, Michael; Avdeeva, V. I.; Levkoev, I. I.; Loiko, M. M.

doi:10.1007/bf00617286

Cited by 10 publications

(14 citation statements)

References 4 publications

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“…Tolmachev et al [95,96] have established that the vinylеnе shift slightly depends on the solvent nature; absorption maxima of pyrylo-4-сyanines and their hеtеroanalogues 5 measured in both low-polar dichlormethane and higher polar nitromethane are presented in Table 1. 0 630 627 1 762 132 755 128 2 889 127 879 124 3 1016 127 1000 121 Se 0 673 672 1 805 132 795 123 2 930 125 922 127 3 1055 125 1035 113 Since in the excited state the lengths of CC-bonds within the сhromophore are also equalized similarly to the ground state, the vinylеnе shifts obtained from fluorescence spectra, V fl , are close to those obtained from absorption band maxima, V abs , [97,98]. To confirm this conclusion, the spectral data of well-known сyaninе dyes 6-8 are collected in Table 2.…”

Section: A N U S C R I P Tmentioning

confidence: 54%

Molecular design of near infrared polymethine dyes: A review

et al. 2015

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Section: A N U S C R I P Tmentioning

confidence: 54%

Molecular design of near infrared polymethine dyes: A review

et al. 2015

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“…The absorption spectra of thiacyanines IV, X = S, in alcohol; the number of the curve corresponds to the number of vinylene groups in the chain n (dyes with n > 3 contain trimethylene bridging groups in the chain [51,52]). decrease of more than two orders of magnitude in the quantum yield of fluorescence, whereas the transition from dicarbocyanines (n = 2) to tricarbocyanines (n = 3) has comparatively little effect on the effectiveness, as seen from the spectral data presented in Table 1 [57]. investigations of the fluorescence spectra of thiacyanines IV, Y = S, showed that two components differing significantly in their life times exist in the excited state [58,59].…”

Section: Features Of the Chemical Structure And Electronic Statementioning

confidence: 90%

The Solitonic Nature of the Electronic Structure of the Ions of Linear Conjugated Systems

Kachkovskii

2005

Theor Exp Chem

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Features of the electron density distribution in the ground and excited states, the position of the energy levels, and the equilibrium molecular geometry of the ions of linear p-electron systems, including conjugated polymers and oligomers, cationic and anionic polymethine dyes, and the radical-ions of a,w-substituted polyenes, are reviewed. By using the soliton concept it was possible to explain many unusual properties of this type of organic compound: The quasimetallic conductivity, the marked change in the spectral characteristics of ionic dyes absorbing and emitting light in the near IR region of the spectrum, etc. It was shown on the basis of semiempirical and nonempirical calculations that the charges in collective p-electronic systems form soliton waves, the width of which does not depend on the length of the molecule. In the excited state the size of the solitons increases significantly. The introduction of donor and acceptor terminal groups can destroy the symmetry of the charge distribution and molecular geometry at a conjugation chain of critical length exceeding the dimensions of the soliton. It was established that the injection of electrons/holes not only leads to the appearance of a soliton level at the center of the energy gap but is also accompanied by significant displacement of the top of the valence band and the bottom of the conduction band.

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“…Flash photolysis equipment with flash energy 50 J and flash duration at half maximum of 7 µs [8] and dye laser flash photolysis equipment (λ gen = 540 nm, excitation with a nitrogen laser, λ ex = 337 nm, W = 0.8 mJ, τ 1/2 ≈ 1 ns) [9] were used for the study of the triplet state of DTCC, trans-cisphotoisomerization, back thermal isomerization, determination of the quenching rate constant of the dye triplet state by oxygen. Measurements of fluorescence quantum yields of the dye were carried out on an "Amico-Bowman" spectrofluorimeter with an R136 photomultiplier by the comparison with the standard, DTCC in methanol (with fluorescence quantum yield of 5% [10,11]). In this work, calf thymus DNA (Aldrich) purified by dialysis was used [12].…”

Section: Methodsmentioning

confidence: 99%

Complex formation between 3;3´‐diethylthiacarbocyanine iodide and DNA and its investigation in aqueous solution

Anikovsky

Татиколов

Кузьмин

1999

International Journal of Photoenergy

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Abstract. The binding of 3, 3 -diethylthiacarbocyanine iodide (DTCC) with molecules of DNA was investigated by different photochemical methods. Absorption spectra were investigated under various concentration of DNA. Isosbestic points observed in these spectra are attributable to existence of two different complexes DTCC with DNA. Equilibrium constants of the formation of complexes I and II were determined (K 1 ≈ 10 6 M −1 , K 2 ≈ 5 × 10 4 M −1 accordingly). Differential absorption spectra of two photoisomers of DTCC were obtained by flash photolysis method; it was found that the quantum yield of the short-lived photoisomer decreases and the quantum yield of the second long-lived photoisomer builds up with the increase in the DNA concentration. Kinetics of interaction between the triplet state of the dye and oxygen were investigated under various concentration of DNA. The growth of the quantum yield of fluorescence and intersystem crossing was observed with the increase in the DNA concentration.

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Dependence of the luminescence and generation properties of solutions of polymethine dyes on their structure

Cited by 10 publications

References 4 publications

Molecular design of near infrared polymethine dyes: A review

Molecular design of near infrared polymethine dyes: A review

The Solitonic Nature of the Electronic Structure of the Ions of Linear Conjugated Systems

Complex formation between 3;3´‐diethylthiacarbocyanine iodide and DNA and its investigation in aqueous solution

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