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Bicarbonate-mediated proton transfer requires cations

Author

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  • Qianbao Wu

    (University of Electronic Science and Technology of China)

  • Na Yang

    (University of Electronic Science and Technology of China)

  • Mengjun Xiao

    (University of Electronic Science and Technology of China)

  • Wei Wang

    (University of Electronic Science and Technology of China)

  • Chunhua Cui

    (University of Electronic Science and Technology of China)

Abstract

Near-neutral HCO3– aqueous solution plays an essential role in respiratory, mineralization and catalysis, yet the interconversion between hydrated CO2, HCO3– and CO32– and the associated proton transfer under such proton-deficient conditions remain uncovered. Here we reveal that cation enables HCO3– to self-dissociate into OH– and CO2 through a pH-independent process, where CO2 hydration and subsequent proton transfer in acid-base reactions lead to the overall exchange of oxygen isotopes between HCO3– and H2O tracked by oxygen isotope-labeled Raman spectroscopy. Isolating HCO3– from cations with crown ether impedes HCO3– dissociation and the following reactions. Further molecular dynamics simulations demonstrate that the interplay between HCO3– and hydrated cations drives HCO3– dissociation. This study suggests a natural proton channel upon coupling HCO3– with cations.

Suggested Citation

  • Qianbao Wu & Na Yang & Mengjun Xiao & Wei Wang & Chunhua Cui, 2024. "Bicarbonate-mediated proton transfer requires cations," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53526-5
    DOI: 10.1038/s41467-024-53526-5
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    References listed on IDEAS

    as
    1. Florian N. Brünig & Manuel Rammler & Ellen M. Adams & Martina Havenith & Roland R. Netz, 2022. "Spectral signatures of excess-proton waiting and transfer-path dynamics in aqueous hydrochloric acid solutions," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    2. Markus Schröder & Fabien Gatti & David Lauvergnat & Hans-Dieter Meyer & Oriol Vendrell, 2022. "The coupling of the hydrated proton to its first solvation shell," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Lei Fan & Xiaowan Bai & Chuan Xia & Xiao Zhang & Xunhua Zhao & Yang Xia & Zhen-Yu Wu & Yingying Lu & Yuanyue Liu & Haotian Wang, 2022. "CO2/carbonate-mediated electrochemical water oxidation to hydrogen peroxide," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
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