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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Skalski, Bohdan
Adam Mickiewicz University in Poznań
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2018The influence of ligand charge and length on the assembly of Brome mosaic virus derived virus-like particles with magnetic core
- 2018The influence of ligand charge and length on the assembly of Brome mosaic virus derived virus-like particles with magnetic corecitations
- 2016Interactions between magnetic nanoparticles and model lipid bilayers - Fourier transformed infrared spectroscopy (FTIR) studies of the molecular basis of nanotoxicitycitations
- 2004Spectral and photophysical properties of the lowest excited triplet state of 4-thiouridine and its 5-halogeno derivativescitations
- 2002Intra- and intermolecular electronic relaxation of the second excited singlet and the lowest excited triplet states of 1,3-dimethyl-4-thiouracil in solution
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article
Spectral and photophysical properties of the lowest excited triplet state of 4-thiouridine and its 5-halogeno derivatives
Abstract
<p>The properties of the lowest excited triplet state (T<sub>1</sub>) of 2′,3′,5′-tri-O-acetyl-4-thiouridine (TU) and its 5-halogeno substituted derivatives (XTU, X = F, Cl, Br and I) in CCl<sub>4</sub> solutions are presented. Steady-state and pulsed techniques were used to characterize the T<sub>1</sub> state of TU and XTU in terms of the phosphorescence quantum yields (φ<sub>p</sub><sup>0</sup>), intrinsic lifetimes (τ<sub>T1</sub><sup>0</sup>) and the self-quenching rate constants (k<sub>sq</sub>). The quantum yields of photochemical decay ( <sub>pch</sub>) of TU and XTU were also determined. From the values of quantum yields and under assumption that the formation of the T<sub>1</sub> state can be approximated by <sub>T1</sub>=1, the rate constants of radiative (k<sub>p</sub>) and non-radiative (k<sub>nr</sub>) decay processes from the T<sub>1</sub> state were calculated. The results of the studies show that the T<sub>1</sub> states of TU and XTU have a ππ* nature. Comparison of the absorption and phosphorescence spectral properties of TU and XTU molecules with those of 1,3-dimethyl-4-thiouracil (DMTU) confirms that TU and XTU exist in CCl<sub>4</sub> solution as (C-2)-keto-(C-4)-thione tautomers, exclusively, and that the phosphorescence arises from the excited T<sub>1</sub> state of these single tautomeric forms. The effect of the halogen substituent on the T<sub>1</sub> state properties of XTU molecules is discussed. © 2004 Elsevier B.V. All rights reserved.</p>