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Time-resolved fluorescence and fluorescence anisotropy of calixarene: Elucidation of the excitation energies of various conformers
- Time-resolved fluorescence and fluorescence anisotropy of calixarene: Elucidation of the excitation energies of various conformers
- Boo B.H.; Kim H.S.; Koh S.G.; Lee M.; No K.
- Ewha Authors
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- Journal of Molecular Structure
- Journal of Molecular Structure vol. 1031, pp. 119 - 124
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- Fluorescence, fluorescence excitation, time-resolved fluorescence spectroscopic, time-dependent fluorescence anisotropy, and time-dependent (TD) DFT studies were carried out to elucidate the excitation energies, fluorescence decay kinetics, and excitation transfer dynamics of calixarene. We found that TD DFT calculations help to analyze the absorption spectra by elucidating the variation of the oscillator strengths with the excitation energies of various conformers involved and to clarify their relative importance. The TD DFT calculations imply that a cone-shaped conformer plays the most important role in the absorption spectrum. Fluorescence in a methanol solvent has a lifetime of 3.11 ± 0.1 ns and the decay kinetics is not found to have particular propensity with respect to solvent polarity. When the molecules in a glass matrix at 77 K were excited by short laser pulses, fluorescence anisotropy was observed. From the time-dependent fluorescence anisotropy, we derived the energy transfer rate constant and fluorescence anisotropy decay time, respectively: ket=1.7×109s-1,τh=0.59ns. © 2012 Elsevier B.V. All rights reserved.
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