Structure of a Mixed-Valence Iron Fluoride, Fe2F5·2H2O

William Hall, Stephen Kim, Jon Zubieta, Erick G. Walton, David B. Brown

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Abstract

The mixed-valence iron compound, Fe2F5·2H2O, crystallizes in the orthorhombic system, space group Imma. The unit cell has dimensions a = 7.489 (7), b = 10.897 (8), and c = 6.671 (6) Å and contains four formula weights. The calculated and experimental densities are 2.96 and 2.94 g/cm3, respectively, at 20 ± 1 °C. Measurements of diffracted intensities employed -2 scans with filtered Mo Kaαradiation on a Picker diffractometer. A total of 250 reflections in the range 2 ≤ 2θ < 50° were retained as observed. The structure was determined using the heavy-atom method and least-squares refinement. The final conventional discrepancy factor was 0.053. The nonmolecular solid possesses a three-dimensional network structure with distinct Fe(II) and Fe(III) coordination sites. The average Fe(II)-F and Fe(III)-F bond lengths are 2.060 (6) and 1.941 (6) Å, respectively. The aquo groups are coordinated to the iron(II) with Fe-O bond length of 2.13(1) Å.

Original languageEnglish (US)
Pages (from-to)1884-1887
Number of pages4
JournalInorganic Chemistry
Volume16
Issue number8
DOIs
StatePublished - Aug 1 1977
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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