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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Migration of Protons during the Excited-State Tautomerization of Aqueous 3-Hydroxyquinoline
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Migration of Protons during the Excited-State Tautomerization of Aqueous 3-Hydroxyquinoline

机译：3-羟基喹啉水溶液激发态互变异构过程中质子的迁移

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摘要

The detailed mechanism of proton transfer and the individual catalytic roles of H_2O,H_3O~+,and OH in the excited-state tautomerization of aqueous 3-hydroxyquinoline are determined by measuring fluorescence kinetic constants as functions of wavelength,pH,hydrogen isotope,and temperature.The molecule undergoes tautomerization in a stepwise manner by forming an anionic intermediate and the tautomer on time scales of 600 and 1200 ps,respectively,in the pH region of 7-8.However,the intermediate transforms rapidly into the tautomer in the pH region of 4-6 owing to the migration of the proton concurrently formed with the intermediate.This provides experimental evidence of the idea that the extremely fast migration of protons in water occurs by continuously forming and breaking hydrogen bonds involved in hydrated proton clusters.
机译：通过测量荧光动力学常数随波长，pH，氢同位素和温度的函数，确定质子转移的详细机理以及H_2O，H_3O〜+和OH在3-羟基喹啉水溶液的激发态互变异构中的单独催化作用。通过在600和1200 ps的时间范围内分别在7-8的pH范围内形成阴离子中间体和互变异构体，使分子以逐步方式进行互变异构化，但是，该中间体在pH范围内迅速转变为互变异构体。由于与中间产物同时形成的质子迁移，导致4-6的原子迁移。这提供了以下想法的实验证据：质子在水中的极快迁移是通过连续形成和破坏水合质子簇中涉及的氢键而发生的。

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