Analysis of fluorescence quenching of coumarin derivatives by 4-hydroxy-TEMPO in aqueous solution

Journal of Fluorescence
Krzysztof ŻamojćLech Chmurzyński

Abstract

The fluorescence quenching of different coumarin derivatives (7-hydroxy-4-methylcoumarin, 5,7-dimethoxycoumarin, 7-amino-4-methyl-3-coumarinylacetic acid, 7-ethoxy-4-methylcoumarin, 7-methoxycoumarin, 7-hydroxycoumarin, 7-hydroxy-4-methyl-3-coumarinylacetic acid and 7-amino-4-methylcoumarin) by 4-hydroxy-TEMPO in aqueous solutions at the room temperature was studied with the use of UV-Vis absorption spectroscopy as well as a steady-state and time-resolved fluorescence spectroscopy. In order to understand the mechanism of quenching the absorption and fluorescence emission spectra of all coumarins along with fluorescence decays were recorded under the action of 4-hydroxy-TEMPO. The Stern-Volmer plots (both from time-averaged and time-resolved measurements) displayed no positive (upward) deviation from a linearity. The fluorescence quenching mechanism was found to be entirely dynamic, what was additionally confirmed by the registration of Stern-Volmer plots at different temperatures. The Stern-Volmer quenching constants and bimolecular quenching rate constants were obtained for all coumarins studied at the room temperature. The findings demonstrate the possibility of developing an analytical method for the quantitative determinati...Continue Reading

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Citations

Jul 17, 2014·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Krzysztof ŻamojćLech Chmurzyński
Dec 4, 2014·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Krzysztof ŻamojćLech Chmurzyński
Sep 13, 2015·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Joanna MakowskaLech Chmurzyński
May 30, 2016·Journal of Colloid and Interface Science·Alexandre BettoschiFrancesca Cuomo
Sep 22, 2017·Physical Chemistry Chemical Physics : PCCP·Henrik GustmannJosef Wachtveitl
Apr 23, 2017·Journal of Fluorescence·Derya Topkaya, Serap Alp
Dec 8, 2016·Journal of Fluorescence·Lamine CisseJean-Jacques Aaron

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