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Chemical Reactions in Aqueous Solutions03:03

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OH Stretching Dynamics in Hydroxide Aqueous Solutions.

Marco Sbroscia1, Armida Sodo1, Fabio Bruni1

  • 1Dipartimento di Scienze , Universitá degli Studi Roma Tre , Via della Vasca Navale 84 , 00146 Roma , Italy.

The Journal of Physical Chemistry. B
|March 14, 2018
PubMed
Summary
This summary is machine-generated.

The properties of aqueous solutions depend on the number of water molecules per ion, not whether the ion is a water "structure maker" or "breaker." This finding holds true regardless of ion identity, challenging traditional concepts.

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Area of Science:

  • Physical Chemistry
  • Solution Chemistry
  • Spectroscopy

Background:

  • The traditional "structure maker" and "structure breaker" ion classification in aqueous solutions is debated.
  • A critical number of water molecules per ion may dictate solution properties, independent of ion identity.

Purpose of the Study:

  • To investigate the role of water molecules per ion in aqueous solution properties.
  • To challenge the conventional ion classification using Raman spectroscopy.

Main Methods:

  • Raman spectra of hydroxide aqueous solutions were analyzed.
  • Spectra were examined in the OH stretching mode region under ambient conditions.
  • A model-free approach analyzed spectral contributions from OH- ions and solvent water.

Main Results:

  • Two distinct solvent contributions were identified in the Raman spectra.
  • One solvent contribution showed concentration-dependent spectral broadening similar to OH-.
  • Significant structural and dynamical changes occur when water molecules per ion drop below approximately 20.

Conclusions:

  • Solution properties are governed by the water-to-ion ratio, not ion type.
  • A critical hydration number (around 20 water molecules/ion) influences structural and dynamical changes.
  • Raman spectroscopy reveals ion-specific hydration effects are less significant than previously thought.