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• W2037017264 endingPage "5553" @default.
• W2037017264 startingPage "5541" @default.
• W2037017264 abstract "Intermolecular static and dynamic fluorescence quenching constants of eight coumarin derivatives by nucleobase derivatives have been determined in aqueous media. One common sequence of the quenching efficiency has been found for the nucleobases. The feasibility of a photoinduced electron transfer reaction for the nucleobase-specific quenching of fluorescent dyes is investigated by the calculation of the standard free energy changes with the Rehm−Weller equation. A complete set of one-electron redox potential data for the nucleobases are determined electrochemically in aprotic solvents for the first time, which are compared with values obtained by various other methods. Depending on the redox properties of the fluorescent dyes, the sequences of the quenching efficiencies can be rationalized by the orders of electrochemical oxidation potentials (vs NHE) of nucleosides (dG (+1.47 V) < dA < dC ≈ dT < U (≥ +2.39 V)) and reduction potentials (dG (< −2.76 V) < dA < dC < dT < U (−2.07 V)). The correlation between the intermolecular dynamic quenching constants and the standard free energy of photoinduced electron transfer according to the classical Marcus equation indicates that photoinduced electron transfer is the rate-limiting step. However, an additional, water-specific gain of free energy between −0.5 and −0.9 eV shows that additional effects, like a coupled proton transfer and a hydrophobic effect, have to be considered, too. Furthermore, the capability of the nucleobases to form ground state complexes with fluorescent dyes is influenced by their redox potentials. The relevance of these observations to current efforts for DNA sequencing with a detection by laser-induced fluorescence and their application to other dyes are discussed." @default.
• W2037017264 created "2016-06-24" @default.
• W2037017264 creator A5001132133 @default.
• W2037017264 creator A5005369347 @default.
• W2037017264 creator A5066726616 @default.
• W2037017264 date "1996-01-01" @default.
• W2037017264 modified "2023-10-16" @default.
• W2037017264 title "Nucleobase-Specific Quenching of Fluorescent Dyes. 1. Nucleobase One-Electron Redox Potentials and Their Correlation with Static and Dynamic Quenching Efficiencies" @default.
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