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Issue 4, 2011
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Influence of the solvent on the ground- and excited-state buffer-mediated proton-transfer reactions of a xanthenic dye

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Abstract

The buffer-mediated proton-transfer reactions of the fluorescent xanthenic derivative 9-[1-(2-Methyl-4-methoxyphenyl)]-6-hydroxy-3H-xanthen-3-one (TG-II) have been studied in different aqueous media. We have employed various buffers to investigate the influence of donor/acceptor systems with different anion and/or cation chemical constituents on the kinetic parameters of proton-transfer. The kinetic parameters were recovered both in the ground-state by means of Fluorescence Lifetime Correlation Spectroscopy (FLCS) and in the excited-state by means of Time Correlated Single Photon Counting (TCSPC) and Global Compartmental Analysis (GCA). Both ground- and excited- deprotonation and protonation recovered rate constants in the presence of either phosphate or acetate buffer as donor/acceptor systems were similar. The presence of Tris-HCl buffer does not promote the excited-state proton-transfer (ESPT) reaction. The results indicate the influence of the ions on the ground-state proton-transfer (GSPT) rates and concomitantly on the ESPT reaction. The proton-transfer rate constants recovered here show a trend correlated with the Hofmeister series or the Marcus classification of ions.

Graphical abstract: Influence of the solvent on the ground- and excited-state buffer-mediated proton-transfer reactions of a xanthenic dye

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Supplementary files

Article information


Submitted
19 Jul 2010
Accepted
27 Oct 2010
First published
22 Dec 2010

Phys. Chem. Chem. Phys., 2011,13, 1685-1694
Article type
Paper

Influence of the solvent on the ground- and excited-state buffer-mediated proton-transfer reactions of a xanthenic dye

J. M. Paredes, L. Crovetto, A. Orte, J. M. Alvarez-Pez and E. M. Talavera, Phys. Chem. Chem. Phys., 2011, 13, 1685
DOI: 10.1039/C0CP01232G

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