Degradation of J-aggregates in solutions exposed to light

Shcheblykin, I. G.; Sliusarenko, A. Yu.; Bataev, N. N.; Auweraer, Mark Van der; Varnavsky, O.P.; Vitukhnovsky, A. G.

doi:10.1007/bf02508790

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…A special attention was paid to avoid photo damage of the sample under laser irradiation. Degradation of the sample revealed as a decrease of the fluorescence intensity and shortening of the fluorescence decay time . Fortunately, in the frozen solution the photo degradation was much less important than at room temperature, however, each point of the sample was used only for a limited number of experiments.…”

Section: Methodsmentioning

confidence: 99%

Excitons in Molecular Aggregates of 3,3‘-Bis-[3-sulfopropyl]-5,5‘-dichloro-9- ethylthiacarbocyanine (THIATS): Temperature Dependent Properties

et al. 2001

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J-aggregates of the dye THIATS (triethylammonium salt of 3,3‘-bis-[3-sulfopropyl]-5,5‘-dichloro-9-ethylthiacarbocyanine) with a two-component Davydov splitting of the exciton band were investigated in the temperature range from 5 to 130 K and at room temperature. A wide set of excitonic and optical characteristics (absorption line broadening, fluorescence line broadening, Stokes shift, coherence length, exciton migration rate, and wavelength dependence of the fluorescence decay time) of the same J-aggregates is presented. The exciton migration rate was found to be the most temperature sensitive property. The temperature dependence of a whole set of exciton properties reveals two critical temperatures: 30 and 70 K. The observed phenomena are described qualitatively as an interplay of static and dynamic disorder effects. At low temperature (T < 20 K) static disorder is the main factor which limits the coherence length and exciton−exciton annihilation rate and determines the absorption width. An intraband, subnanosecond exciton relaxation toward the lower energy states is observed. Below 20 K only a limited number of exciton states of the molecular ensemble are reached by the exciton during downhill relaxation. While the temperature increases from 30 to 70 K, a wider set of states becomes accessible for the exciton during its relaxation. The “internal” structure of the exciton band becomes blurred by homogeneous broadening and the coherence length decreases. Very fast exciton wave packet motion occurs over 106−107 molecules. At temperatures higher than 80 K, we suggest dynamical processes to play the most important role. The Stokes shift becomes temperature independent. Exciton migration starts to be strongly blocked by scattering on optical phonons. The effective, long distance exciton migration in THIATS J-aggregates as well as peculiarities of the Stokes shift and line broadening temperature dependence allow us to conclude that no exciton self-trapping process occurs at temperatures higher than 20 K.

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Section: Methodsmentioning

confidence: 99%

Excitons in Molecular Aggregates of 3,3‘-Bis-[3-sulfopropyl]-5,5‘-dichloro-9- ethylthiacarbocyanine (THIATS): Temperature Dependent Properties

et al. 2001

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Dimensionality and temperature dependence of the radiative lifetime of J-aggregates with Davydov splitting of the exciton band

Scheblykin

Bataiev

Auweraer

et al. 2000

Chemical Physics Letters

108

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Thermally controlled preferential molecular aggregation state in a thiacarbocyanine dye

Passier

Ritchie

Toro

et al. 2010

The Journal of Chemical Physics

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Herein we report the experimental and theoretical study of the temperature dependence of a thiacarbocyanine dye in its monomer, H- and J-aggregates states. We demonstrate the ability to control the ratio of monomer, H- and/or J-aggregates with heat. We link such a control to the conformation dependence of the molecule. An alternative way to gain access to the dominating species without changing the concentration as a complete switching mechanism between all the present species is proposed. The results presented in this work lead to a better understanding of thiacarbocyanine dye's behavior.

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Degradation of J-aggregates in solutions exposed to light

Cited by 3 publications

References 12 publications

Excitons in Molecular Aggregates of 3,3‘-Bis-[3-sulfopropyl]-5,5‘-dichloro-9- ethylthiacarbocyanine (THIATS): Temperature Dependent Properties

Excitons in Molecular Aggregates of 3,3‘-Bis-[3-sulfopropyl]-5,5‘-dichloro-9- ethylthiacarbocyanine (THIATS): Temperature Dependent Properties

Dimensionality and temperature dependence of the radiative lifetime of J-aggregates with Davydov splitting of the exciton band

Thermally controlled preferential molecular aggregation state in a thiacarbocyanine dye

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