Specific Ion Effects of Chaotropic and Superchaotropic Anions Probed by Raman Hydration-Shell Spectroscopy.

Werner M Nau, Denilson Mendes de Oliveira, Andres S Urbina, Harald Knorke, Jonas Warneke, Andrea Barba-Bon, Dor Ben-Amotz

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Article in Angewandte Chemie (International ed. in English), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

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5 · Who and what money

Authors and funding

7 authors.

Werner M NauSchool of Science, Constructor University, Bremen, Germany.ORCID https://orcid.org/0000-0002-7654-6232

Denilson Mendes de OliveiraDepartment of Chemistry, Purdue University, West Lafayette, Indiana, USA.

Andres S UrbinaDepartment of Chemistry, Purdue University, West Lafayette, Indiana, USA.

Harald KnorkeWilhelm-Ostwald-Institut Für Physikalische und Theoretische Chemie, Universität Leipzig, Leipzig, Germany.ORCID https://orcid.org/0000-0001-6070-1827

Jonas WarnekeWilhelm-Ostwald-Institut Für Physikalische und Theoretische Chemie, Universität Leipzig, Leipzig, Germany.ORCID https://orcid.org/0000-0002-3233-7412

Andrea Barba-BonSchool of Science, Constructor University, Bremen, Germany.ORCID https://orcid.org/0000-0003-0712-4869

Dor Ben-AmotzDepartment of Chemistry, Purdue University, West Lafayette, Indiana, USA.

Funding

European Research CouncilEuropean Union's Horizon 2020 research and innovation program 101224291National Science Foundation CHE-1763581

6 · The paper itself

Abstract

Chaotropic ions enhance protein solubility and the associated Hofmeister effects are widely used in biotechnology and materials science. However, the characterization of the recently discovered class of superchaotropic borate cluster anions remains incomplete, limiting their rational application. Using Raman multivariate curve resolution spectroscopy, we measured the O─H stretching vibrational frequencies of hydration-shell water molecules surrounding both conventional and superchaotropic anions. For conventional monoanions, we observed dangling O-H bands in their hydration-shell spectra, whose vibrational frequencies increase with chaotropicity and follow the trend Br

Indexed as

chaotropic effectHofmeister effectshydrogen bondshydrophobic effectsuperchaotropic ionswater structure

Identifiers

PMID42171440

DOI10.1002/anie.6630432

PMCPMC13327565

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