4.6 Article

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

期刊

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 13, 期 4, 页码 1685-1694

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp01232g

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资金

  1. Ministerio Espanol de Ciencia e Innovacion [CTQ2007-61619/BQU, CTQ2010-20507/BQU]
  2. FEDER
  3. EU

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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.

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