X-ray diffraction study of ferric chloride solutions and hydrated melt. Analysis of the iron (III)-chloride complexes formation

Mauro Magini, T. Radnái

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Abstract

A series of concentrated ferric chloride solutions, both neutral and acidic, as well as the hydrated melt FeCl3-OH2O have been studied by x-ray diffraction. The changes in the radial distribution curves by varying iron concentration or Cl-/Fe3+ ratio and least squares fitting of the structure functions for various solute models lead to an unambiguous conclusion with respect to the dominant species which are present in the solutions. The existence of monochloro, dichloro, trichloro, and tetrachloro complexes, predicted by literature information in dilute solutions, has been established in the different solutions investigated. Octahedral complexes, mainly Fe(H2O)4Cl2+ and Fe(H2O)3Cl3, are the principal species occurring in neutral and acidic solutions while in the hydrated melt tetrahedral FeCl4- predominates. Species of the type FeCl 5(H2O)2- or FeCl63- as well as polymeric network are excluded. Hydration water molecules around Cl - anions has been found for both free chloride and chloride ions bonded to iron atoms. Second order interactions around Fe3+ ions are strongly suggested by the presence of a large peak at about 4.2 Å in the distribution curves.

Original languageEnglish
Pages (from-to)4255-4262
Number of pages8
JournalThe Journal of Chemical Physics
Volume71
Issue number11
Publication statusPublished - 1979

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Chlorides
Iron
chlorides
iron
X ray diffraction
diffraction
x rays
Ions
curves
radial distribution
Hydration
Anions
hydration
solutes
ions
x ray diffraction
Diffraction
ferric chloride
anions
X rays

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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title = "X-ray diffraction study of ferric chloride solutions and hydrated melt. Analysis of the iron (III)-chloride complexes formation",
abstract = "A series of concentrated ferric chloride solutions, both neutral and acidic, as well as the hydrated melt FeCl3-OH2O have been studied by x-ray diffraction. The changes in the radial distribution curves by varying iron concentration or Cl-/Fe3+ ratio and least squares fitting of the structure functions for various solute models lead to an unambiguous conclusion with respect to the dominant species which are present in the solutions. The existence of monochloro, dichloro, trichloro, and tetrachloro complexes, predicted by literature information in dilute solutions, has been established in the different solutions investigated. Octahedral complexes, mainly Fe(H2O)4Cl2+ and Fe(H2O)3Cl3, are the principal species occurring in neutral and acidic solutions while in the hydrated melt tetrahedral FeCl4- predominates. Species of the type FeCl 5(H2O)2- or FeCl63- as well as polymeric network are excluded. Hydration water molecules around Cl - anions has been found for both free chloride and chloride ions bonded to iron atoms. Second order interactions around Fe3+ ions are strongly suggested by the presence of a large peak at about 4.2 {\AA} in the distribution curves.",
author = "Mauro Magini and T. Radn{\'a}i",
year = "1979",
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journal = "Journal of Chemical Physics",
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T1 - X-ray diffraction study of ferric chloride solutions and hydrated melt. Analysis of the iron (III)-chloride complexes formation

AU - Magini, Mauro

AU - Radnái, T.

PY - 1979

Y1 - 1979

N2 - A series of concentrated ferric chloride solutions, both neutral and acidic, as well as the hydrated melt FeCl3-OH2O have been studied by x-ray diffraction. The changes in the radial distribution curves by varying iron concentration or Cl-/Fe3+ ratio and least squares fitting of the structure functions for various solute models lead to an unambiguous conclusion with respect to the dominant species which are present in the solutions. The existence of monochloro, dichloro, trichloro, and tetrachloro complexes, predicted by literature information in dilute solutions, has been established in the different solutions investigated. Octahedral complexes, mainly Fe(H2O)4Cl2+ and Fe(H2O)3Cl3, are the principal species occurring in neutral and acidic solutions while in the hydrated melt tetrahedral FeCl4- predominates. Species of the type FeCl 5(H2O)2- or FeCl63- as well as polymeric network are excluded. Hydration water molecules around Cl - anions has been found for both free chloride and chloride ions bonded to iron atoms. Second order interactions around Fe3+ ions are strongly suggested by the presence of a large peak at about 4.2 Å in the distribution curves.

AB - A series of concentrated ferric chloride solutions, both neutral and acidic, as well as the hydrated melt FeCl3-OH2O have been studied by x-ray diffraction. The changes in the radial distribution curves by varying iron concentration or Cl-/Fe3+ ratio and least squares fitting of the structure functions for various solute models lead to an unambiguous conclusion with respect to the dominant species which are present in the solutions. The existence of monochloro, dichloro, trichloro, and tetrachloro complexes, predicted by literature information in dilute solutions, has been established in the different solutions investigated. Octahedral complexes, mainly Fe(H2O)4Cl2+ and Fe(H2O)3Cl3, are the principal species occurring in neutral and acidic solutions while in the hydrated melt tetrahedral FeCl4- predominates. Species of the type FeCl 5(H2O)2- or FeCl63- as well as polymeric network are excluded. Hydration water molecules around Cl - anions has been found for both free chloride and chloride ions bonded to iron atoms. Second order interactions around Fe3+ ions are strongly suggested by the presence of a large peak at about 4.2 Å in the distribution curves.

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