Geminate（OH，eaq-）对在浓碱溶液中的分解：缺乏羟基自由基去质子化的证据
Recombination of Geminate (OH,eaq-) Pairs in Concentrated Alkaline Solutions: Lack of Evidence For Hydroxyl Radical Deprotonation
摘要：
在200 nm的光解氢氧化物水溶液和400 nm（3光子）电离的水在浓碱性溶液中产生的水合电子和羟基自由基的皮秒动力学。在亚纳秒时间尺度上没有观察到羟基自由基的去质子化，即使在1-10 M KOH溶液中也是如此。这一结果与稀碱溶液中OH自由基去质子化的动力学数据完全不一致。我们认为，在浓碱性溶液中，羟基自由基的去质子化反应大大减慢。
英文摘要：
Picosecond dynamics of hydrated electrons and hydroxyl radicals generated in 200 nm photodissociation of aqueous hydroxide and 400 nm (3-photon) ionization of water in concentrated alkaline solutions were obtained. No deprotonation of hydroxyl radicals was observed on sub-nanosecond time scale, even in 1-10 M KOH solutions. This result is completely at odds with the kinetic data for deprotonation of OH radical in dilute alkaline solutions. We suggest that the deprotonation of hydroxyl radical is slowed down dramatically in concentrated alkaline solutions.
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