Indication of a Very Large Proton Diffusion in Ice Ih. III. Fluorescence Quenching of 1-Naphthol Derivatives

Indication of a Very Large Proton Diffusion in Ice Ih. III. Fluorescence Quenching of 1-Naphthol Derivatives

The effects of excess protons on the fluorescence quenching process of 1-naphthol-4-sulfonate (1N4S) and 1-naphthol-3-sulfonate (1N3S) in methanol-doped ice samples were studied by employing a time-resolved emission technique. We found that the fluorescence quenching of the deprotonated form RO−* of...

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Veröffentlicht in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2009-02, Vol.113 (6), p.959-974
Hauptverfasser: Uritski, Anna, Presiado, Itay, Huppert, Dan
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Sprache:eng ; jpn
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A: Dynamics, Clusters, Excited States
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container_title The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
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creator Uritski, Anna
Presiado, Itay
Huppert, Dan
description The effects of excess protons on the fluorescence quenching process of 1-naphthol-4-sulfonate (1N4S) and 1-naphthol-3-sulfonate (1N3S) in methanol-doped ice samples were studied by employing a time-resolved emission technique. We found that the fluorescence quenching of the deprotonated form RO−* of both photoacids by protonation is very efficient in ice, whereas in liquid water the proton fluorescence quenching is rather small. Using the Smoluchowski diffusion-assisted binary collision model under certain assumptions and approximations, we found that the calculated proton diffusion constant in ice in the temperature range of 240−260 K was 10 times greater than that of water at 295 K.
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title Indication of a Very Large Proton Diffusion in Ice Ih. III. Fluorescence Quenching of 1-Naphthol Derivatives
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