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[11] in this study the nonlinear regression analysis was performed by taking into account the complete set of spectral data.
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32
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33750610409
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-1 for the dimer band. All fluorescence measurements have been performed on a Jobin-Yvon Fluorolog 3-22 Tau instrument. The decay times were evaluated by applying single exponentials to the time-resolved measurements in the frequency domain.
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33
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33750611699
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note
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-30 C m at a torsion angle of α = 10° calculated at the MP2/6-31G(d,p) level of theory. However, we would like to point out that we are not yet sure if the small transition dipole moment for the lower energy excitonic transition that arises from such a small torsional twist of 10° is sufficient to explain the observed intensity of the dimer fluorescence. Alternatively, a relaxation of the Franck-Condon excited state could be taking place that affords an even more twisted excited state geometry which exhibits an increased radiative transition probability.
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Intense fluorescence has been reported for several merocyanine dyes upon rigidification in frozen solution, the solid state, or in an organogel; see, for example, a) F. Würthner, R. Sens, K.-H. Etzbach, G. Seybold, Angew. Chem. 1999, 111, 1753-1757;
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33750631518
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note
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An even longer fluorescence lifetime of 11.2 ns has been observed for dimers of dye 3, see Ref. [13].
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