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

Werner M Nau1, Denilson Mendes de Oliveira2, Andres S Urbina2

  • 1School of Science, Constructor University, Bremen, Germany.

Angewandte Chemie (International Ed. in English)
|May 22, 2026
PubMed
Summary
This summary is machine-generated.

Superchaotropic borate cluster anions, unlike conventional ions, show unique hydration patterns. Their chaotropic properties are influenced by charge and substituents, impacting water interactions.

Keywords:
Hofmeister effectschaotropic effecthydrogen bondshydrophobic effectsuperchaotropic ionswater structure

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Area of Science:

  • Physical Chemistry
  • Biotechnology
  • Materials Science

Background:

  • Chaotropic ions, known for enhancing protein solubility via Hofmeister effects, are crucial in biotechnology and materials science.
  • The characterization of superchaotropic borate cluster anions is incomplete, hindering their application.

Purpose of the Study:

  • To characterize superchaotropic borate cluster anions using molecular spectroscopy.
  • To establish a spectroscopic scale for ion classification based on hydration shell water vibrations.

Main Methods:

  • Raman multivariate curve resolution spectroscopy was employed.
  • O─H stretching vibrational frequencies of hydration-shell water molecules were measured for various anions.

Main Results:

  • Conventional anions showed increasing dangling O-H frequencies with chaotropicity (Br⁻ < I⁻ < ClO₄⁻ < BF₄⁻ < PF₆⁻).
  • Superchaotropic dodecaborates (B₁₂X₁₂²⁻) exhibited lower dangling O-H frequencies than expected, deviating from classical chaotropes.
  • The halogen substituent trend for dodecaborates was opposite to conventional chaotropes, attributed to charge and screening effects.

Conclusions:

  • A molecular-spectroscopic scale for ion classification was developed.
  • Superchaotropic borates present unique hydration behaviors distinct from conventional chaotropic ions.
  • Charge, charge screening, and substituent effects significantly influence the ion-water interactions and hydration patterns of superchaotropic anions.