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Ferric Chloride Complexes in Aqueous Solution: An EXAFS Study.

Ingmar Persson1

  • 1Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, 750 07 Uppsala, Sweden.

Journal of Solution Chemistry
|June 12, 2018
PubMed
Summary
This summary is machine-generated.

The structure of iron(III) ions in concentrated ferric chloride solutions was investigated. The primary species identified was the trans-[FeCl2(H2O)4]+ complex, not previously observed higher chloroferrate complexes.

Keywords:
Aqueous solutionEXAFSFerric chloridetrans-[FeCl2(H2O)4]+ complex

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Area of Science:

  • Inorganic Chemistry
  • Solution Chemistry
  • Spectroscopy

Background:

  • Ferric chloride solutions are crucial in various chemical processes.
  • Understanding the speciation of iron(III) in aqueous solutions is essential for controlling reactions.
  • Previous studies suggested the presence of higher chloroferrate complexes.

Purpose of the Study:

  • To determine the dominant iron(III) species in concentrated aqueous ferric chloride solutions.
  • To investigate the effect of chloride:iron(III) ratios on iron speciation.
  • To verify the existence of proposed higher chloroferrate complexes.

Main Methods:

  • Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy was employed.
  • Aqueous solutions of ferric chloride with varying chloride:iron(III) ratios were analyzed.
  • EXAFS data was used to elucidate the local structure around the iron(III) ion.

Main Results:

  • In dilute solutions (<1 mmol·dm⁻³), hydrated iron(III) and chloride ions dominate.
  • In concentrated solutions (up to 1.0 mol·dm⁻³), the trans-[FeCl2(H2O)4]+ complex is the main species.
  • No evidence was found for higher chloroferrate(III) or dimeric [Fe2Cl6] complexes, even with excess chloride.

Conclusions:

  • The trans-[FeCl2(H2O)4]+ complex is the predominant iron(III) species in concentrated ferric chloride solutions.
  • The study refutes the presence of higher chloroferrate complexes under the investigated conditions.
  • EXAFS spectroscopy is a powerful tool for determining iron speciation in complex solutions.