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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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Taras-Goślińska, Katarzyna Małgorzata
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2018Carboxyl groups of citric acid in the process of complex formation with bivalent and trivalent metal ions in biological systemscitations
- 2014Relaxation of the T<inf>1</inf> excited state of 2-thiothymine, its riboside and deoxyriboside-enhanced nonradiative decay rate induced by sugar substituentcitations
- 2009Photophysical and photochemical properties of the T<inf>1</inf> excited state of thioinosinecitations
- 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
Intra- and intermolecular electronic relaxation of the second excited singlet and the lowest excited triplet states of 1,3-dimethyl-4-thiouracil in solution
Abstract
<p>Intramolecular processes of deactivation of 1,3-dimethyl-4-thiouracil (DMTU) from the second excited singlet (S<sub>2</sub>) (π, π*) and the lowest excited triplet (T<sub>1</sub>) (π, π*) states have been studied using perfluoro-1,3-dimethylcyclohexane (PFDMCH) as a solvent. The spectral and photophysical (PP) properties of DMTU in CCl<sub>4</sub>, hexane and water have also been described. For the first time, the fluorescence from S<sub>2</sub> state DMTU has been observed. The picosecond lifetime of DMTU in the S<sub>2</sub> state (τ<sub>S2</sub>) in PFDMCH has been proposed to be determined by a very fast intramolecular reversible process of hydrogen abstraction from the ortho methyl group by the thiocarbonyl group. The shortening of τ<sub>S2</sub> in CCl<sub>4</sub> is interpreted to be caused by the intermolecular interactions between DMTU (S<sub>2</sub>) and the solvent. Results of the phosphorescence decay as a function of DMTU concentration were analyzed using the Stern-Volmer formalism, which enabled determination of the intrinsic lifetime of the T<sub>1</sub> state (τ<sub>T1</sub><sup>0</sup>) and rate constants of self-quenching (k<sub>sq</sub>). The lifetimes, τ <sub>T1</sub><sup>0</sup>, of DMTU in PFDMCH and CCl<sub>4</sub> are much longer than the values hitherto obtained in more reactive solvents. The PP properties of DMTU both in the S<sub>2</sub> and T<sub>1</sub> states have been shown to be determined by the thiocarbonyl group.</p>