Recombination of geminate (OH,e_aq⁻) pairs in concentrated alkaline solutions: lack of evidence for hydroxyl radical deprotonation

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• 作者：Lian ; Rui ; Crowell ; Robert A. ; Shkrob ; Ilya A. ; Bartels ; David M. ; Oulianov ; Dmitri A. ; Gosztola ; David
• 刊名：Chemical Physics Letters
• 出版年：2004
• 出版时间：May 11, 2004
• 年：2004
• 卷：389
• 期：4-6
• 页码：379-384
• 全文大小：231 K

文摘

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 the 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.