Identifying Eigen-like hydrated protons at negatively charged interfaces

Eric Tyrode (), Sanghamitra Sengupta and Adrien Sthoer
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Eric Tyrode: KTH Royal Institute of Technology
Sanghamitra Sengupta: KTH Royal Institute of Technology
Adrien Sthoer: KTH Royal Institute of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Despite the importance of the hydrogen ion in a wide range of biological, chemical, and physical processes, its molecular structure in solution remains lively debated. Progress has been primarily hampered by the extreme diffuse nature of the vibrational signatures of hydrated protons in bulk solution. Using the inherently surface-specific vibrational sum frequency spectroscopy technique, we show that at selected negatively charged interfaces, a resolved spectral feature directly linked to the H3O+ core in an Eigen-like species can be readily identified in a biologically compatible pH range. Centered at ~2540 cm−1, the band is seen to shift to ~1875 cm−1 when forming D3O+ upon isotopic substitution. The results offer the possibility of tracking and understanding from a molecular perspective the behavior of hydrated protons at charged interfaces.

Date: 2020
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DOI: 10.1038/s41467-020-14370-5

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