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- W2020874814 endingPage "716" @default.
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- W2020874814 abstract "The ionization state of organic molecules at the air–water interface and the related problem of the surface pH of water have significant consequences on the catalytic role of the surface in chemical reactions and are currently areas of intense research and controversy. In this work, infrared reflection–absorption spectroscopy (IRRAS) is used to identify changes in the ionization state of l-phenylalanine in the surface region versus the bulk aqueous solution. l-phenylalanine has the unique advantage of possessing two different hydrophilic groups, a carboxylic acid and an amine base, which can deprotonate and protonate respectively depending on the ionic environment they experience at the water surface. In this work, the polar group vibrations in the surface region are identified spectroscopically in varying bulk pH solutions, and are subsequently compared with the ionization state of the polar groups of molecules residing in the bulk environment. The polar groups of l-phenylalanine at the surface transition to their deprotonated state at bulk pH values lower than the molecules residing in the bulk, indicating a decrease in their pKa at the surface, and implying an enhanced hydroxide ion concentration in the surface region relative to the bulk." @default.
- W2020874814 created "2016-06-24" @default.
- W2020874814 creator A5045053102 @default.
- W2020874814 creator A5051342774 @default.
- W2020874814 date "2013-01-02" @default.
- W2020874814 modified "2023-10-10" @default.
- W2020874814 title "Ionization state of <scp>l</scp>-Phenylalanine at the Air–Water Interface" @default.
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- W2020874814 doi "https://doi.org/10.1021/ja308089n" @default.
- W2020874814 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23240998" @default.
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