Ion-Solvent and Solvent-Solvent Interactions. X-ray Study of Aqueous Alkali Chloride Solutions

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Abstract

The first neighbour model, FNM, used frequently for the description of hydration has been modified by dropping the assumption that the structure of the “free” solvent is identical with that of the pure solvent. The modified model, FNM2, reproduces the experimental X-ray structure functions of alkali chloride solutions quite well and enables the study of perturbed solvent-solvent interactions. The refined structural parameters reasonably indicate the dependence of the hydration of the alkali cations on their radius and concentration. The hydration of Cl‒ has been found to be almost independent of both concentration and the type of counter cation. The model assumes regular symmetry for the first neighbour coordination sphere, but the high rms deviations of the water-water distances within the shells of the aggregates indicate considerable individual asymmetries. A further modification of the FNM will be discussed in a following paper.

Original languageEnglish
Pages (from-to)107-114
Number of pages8
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume35
Issue number1
DOIs
Publication statusPublished - Jan 1 1980

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Alkalies
Hydration
Chlorides
alkalies
chlorides
Ions
hydration
X rays
Interaction
Cations
ions
x rays
interactions
Water
cations
Structural Parameters
Structure-function
water
Asymmetry
Shell

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Mathematical Physics
  • Physics and Astronomy(all)

Cite this

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abstract = "The first neighbour model, FNM, used frequently for the description of hydration has been modified by dropping the assumption that the structure of the “free” solvent is identical with that of the pure solvent. The modified model, FNM2, reproduces the experimental X-ray structure functions of alkali chloride solutions quite well and enables the study of perturbed solvent-solvent interactions. The refined structural parameters reasonably indicate the dependence of the hydration of the alkali cations on their radius and concentration. The hydration of Cl‒ has been found to be almost independent of both concentration and the type of counter cation. The model assumes regular symmetry for the first neighbour coordination sphere, but the high rms deviations of the water-water distances within the shells of the aggregates indicate considerable individual asymmetries. A further modification of the FNM will be discussed in a following paper.",
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