Crystal Structure
It is slightly soluble in water (Ksp = 2.36 × 10−6) and can be crystallized from it as a colorless tetrahydrate, FeF2·4H2O, (CAS Number 13940-89-1). The latter exists in two crystal structures, one rhombohedral and one hexagonal, the former having a disordered The tetrahydrate oxidizes in moist air to a hydrate of iron(III) fluoride, 2FeF3·9H2O.
To determine impurities in previous crystal structuring of the FeF2 the compound was first melted and then through spectrochemical analysis the percent of impurities could be determined.
Though calculations using the lattice constants, found through X-ray crystallography, the bond lengths were determined as follows:
- d1(Fe-F): 2.03± 0.07Å
- d2(Fe-F): 2.10± 0.04Å
- d (F-F): 2.59± 0.13Å
Read more about this topic: Iron(II) Fluoride
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