Ferric Chloride Complexes in Aqueous Solution: An EXAFS Study

Abstract

A series of concentrated aqueous solutions of ferric chloride with different chloride:iron(III) ratios has been studied by means of EXAFS to determine the structure around the iron(III) ion of the dominating species in such solutions. The dominating species in dilute acidic aqueous solution of ferric chloride, at less than 1 mmol center dot dm(-3), are the hydrated iron(III) and chloride ions, while in concentrated aqueous solution and in solutions with an excess of chloride ions, up to 1.0 mol center dot dm(-3), it is the trans-[FeCl2(H2O)(4)](+) complex. Possible higher chloroferrate(III) or dimeric [Fe2Cl6] complexes at room temperature, as proposed in the literature, were not observed in any of the studied solutions in spite of an excess of chloride ions of 1 mol center dot dm(-3).

Keywords

EXAFS; Ferric chloride; Aqueous solution; trans-[FeCl2(H2O)(4)](+) complex

Published in

Journal of Solution Chemistry
2018, volume: 47, number: 5, pages: 797-805
Publisher: SPRINGER/PLENUM PUBLISHERS

SLU Authors

• Persson, Ingmar

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Physical Chemistry


Publication identifier

DOI: https://doi.org/10.1007/s10953-018-0756-6

Permanent link to this page (URI)

https://res.slu.se/id/publ/95754