Real-time observation of bimodal proton transfer in acid-base pairs in water

Matteo Rini; Ben Zion Magnes; Ehud Pines; Erik T.J. Nibbering

doi:10.1126/science.1085762

Real-time observation of bimodal proton transfer in acid-base pairs in water

Matteo Rini, Ben Zion Magnes, Ehud Pines, Erik T.J. Nibbering

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

432 Scopus citations

Abstract

The neutralization reaction between an acid and a base in water, triggered after optical excitation, was studied by femtosecond vibrational spectroscopy. Bimodal dynamics were observed. In hydrogen-bonded acid-base complexes, the proton transfer proceeds extremely fast (within 150 femtoseconds). In encounter pairs formed by diffusion of uncomplexed photoacid and base molecules, the reaction upon contact was an order of magnitude slower, in agreement with earlier reported values. These results call for a refinement of the traditional Eigen-Weller picture of acid-base reactions: A three-stage model is introduced to account for all observed dynamics.

Original language	English
Pages (from-to)	349-352
Number of pages	4
Journal	Science
Volume	301
Issue number	5631
DOIs	https://doi.org/10.1126/science.1085762
State	Published - 18 Jul 2003

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title = "Real-time observation of bimodal proton transfer in acid-base pairs in water",

abstract = "The neutralization reaction between an acid and a base in water, triggered after optical excitation, was studied by femtosecond vibrational spectroscopy. Bimodal dynamics were observed. In hydrogen-bonded acid-base complexes, the proton transfer proceeds extremely fast (within 150 femtoseconds). In encounter pairs formed by diffusion of uncomplexed photoacid and base molecules, the reaction upon contact was an order of magnitude slower, in agreement with earlier reported values. These results call for a refinement of the traditional Eigen-Weller picture of acid-base reactions: A three-stage model is introduced to account for all observed dynamics.",

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AU - Pines, Ehud

AU - Nibbering, Erik T.J.

PY - 2003/7/18

Y1 - 2003/7/18

N2 - The neutralization reaction between an acid and a base in water, triggered after optical excitation, was studied by femtosecond vibrational spectroscopy. Bimodal dynamics were observed. In hydrogen-bonded acid-base complexes, the proton transfer proceeds extremely fast (within 150 femtoseconds). In encounter pairs formed by diffusion of uncomplexed photoacid and base molecules, the reaction upon contact was an order of magnitude slower, in agreement with earlier reported values. These results call for a refinement of the traditional Eigen-Weller picture of acid-base reactions: A three-stage model is introduced to account for all observed dynamics.

AB - The neutralization reaction between an acid and a base in water, triggered after optical excitation, was studied by femtosecond vibrational spectroscopy. Bimodal dynamics were observed. In hydrogen-bonded acid-base complexes, the proton transfer proceeds extremely fast (within 150 femtoseconds). In encounter pairs formed by diffusion of uncomplexed photoacid and base molecules, the reaction upon contact was an order of magnitude slower, in agreement with earlier reported values. These results call for a refinement of the traditional Eigen-Weller picture of acid-base reactions: A three-stage model is introduced to account for all observed dynamics.

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SP - 349

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ER -

Real-time observation of bimodal proton transfer in acid-base pairs in water

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