AI Article Synopsis
- Water microdroplets display unique properties compared to bulk water, particularly the presence of hydroxyl radicals (OH⋅) at their air-water surface.
- Researchers sprayed pure water microdroplets into a mass spectrometer and discovered the presence of a hydroxyl radical combined with a hydronium cation, referenced as (H O ).
- The study found that reactions previously thought to involve the water dimer cation may actually be due to interactions with the OH⋅-H O complex, and demonstrated that scavengers like caffeine and melatonin can effectively capture these radicals.
Article Abstract
Despite the high stability of bulk water, water microdroplets possess strikingly different properties, such as the presence of hydroxyl radicals (OH⋅) at the air-water interface. Previous studies exhibited the recombination of OH⋅ into H O molecules and the capture of OH⋅ by oxidizing other molecules. By spraying pure water microdroplets into a mass spectrometer, we detected OH⋅ in the form of (H O ) that is essentially OH⋅-H O , a hydroxyl radical combined with a hydronium cation through hydrogen bonding. We also successfully captured it with two OH⋅ scavengers, caffeine and melatonin, and key oxidation radical intermediates that bear important mechanistic information were seen. It is suggested that some previous reactions involving (H O ) should be attributed to reactions with OH⋅-H O rather than with the water dimer cation (H O-OH ) .
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| http://dx.doi.org/10.1002/anie.202207587 | DOI Listing |
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