0000000000049898

AUTHOR

János Erostyák

showing 3 related works from this author

Anthracene Fluorescence Quenching by a Tetrakis (Ketocarboxamide) Cavitand

2014

Quenching of both fluorescence lifetime and fluorescence intensity of anthracene was investigated in the presence of a newly derived tetrakis (ketocarboxamide) cavitand at various concentrations. Time-correlated single photon counting method was applied for the lifetime measurements. A clear correlation between the fluorescence lifetime of anthracene as a function of cavitand concentration in dimethylformamide solution was observed. The bimolecular collisional quenching constant was derived from the decrease of lifetime. Fluorescence intensity was measured in the emission wavelength region around 400 nm as a result of excitation at 280 nm. Effective quenching was observed in the presence of…

AnthraceneQuenching (fluorescence)Article SubjectChemistryAnalytical chemistryCavitandPhotochemistryseoksetFluorescenceAtomic and Molecular Physics and OpticsPhoton countingcarbon-tetrachlorideAnalytical Chemistrychemistry.chemical_compoundWavelengthlcsh:QC350-467Dimethylformamideta116stern-volmer plotslcsh:Optics. LightSpectroscopyExcitationJournal of Spectroscopy
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Subpicosecond transient signal spectroscopy of Prodan in dimethylformamide solution.

2008

We report a pump-probe experiment revealing the temporal evolution of subpicosecond evolution of Prodan's excited-state absorption in dimethylformamide. Also, we present calculation of the first spectral moment of this spectral band and estimation of different relaxation components on the subpicosecond time scale.

PhotonsModels StatisticalTime FactorsChemistryPhotochemistryGeneral NeuroscienceLasersRelaxation (NMR)Analytical chemistryDimethylformamideSpectral bandsEquipment DesignMolecular physicsGeneral Biochemistry Genetics and Molecular BiologyAbsorptionchemistry.chemical_compoundKineticsSpectrometry FluorescenceHistory and Philosophy of Science2-NaphthylamineDimethylformamideSpectroscopyAbsorption (electromagnetic radiation)Transient signalFluorescent DyesAnnals of the New York Academy of Sciences
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Femtosecond Transient Absorption Study of the Dynamics of Acrylodan in Solution and Attached to Human Serum Albumin

2003

The excited-state relaxation dynamics of the protein-labeling dye acrylodan in solution and attached to human serum albumin has been studied by femtosecond transient absorption spectroscopy. Time-resolved spectra and kinetics of stimulated emission and excited-state absorption in the wavelength region from 400 to 800 nm were studied in ethanol and dimethylformamide. The excited-state solvation dynamics is characterized by multiexponential behavior in both solvents. In ethanol solution, the time dependence of the transient spectra is interpreted in terms of fast solvent relaxation followed by excited-state isomerization of the dye. Acrylodan attached to the protein shows a relaxation compone…

ChemistryKineticsSolvationAnalytical chemistryHuman serum albuminPhotochemistryFluorescenceSurfaces Coatings and FilmsFemtosecondUltrafast laser spectroscopyMaterials ChemistrymedicineRelaxation (physics)Physical and Theoretical ChemistryAbsorption (chemistry)medicine.drugThe Journal of Physical Chemistry B
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