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.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry