Die Kristallstruktur des gemischtvalenten Eisenfluoridhydrates Fe3F8 · 2 H2O |
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Authors: | E. Herdtweck |
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Abstract: | Crystal Structure of the Mixed-Valence Iron Fluorid Hydrate Fe3F8 · 2 H2O Newly prepared was the red, monoclinic compound Fe3F8 · 2 H2O, single crystals of which could be obtained under hydrothermal high pressure conditions (space group C2/m with a = 761.2(3), b = 750.0(1), c = 746.9(3) pm, β = 118.38(2)° and Z = 2). The X-ray structure determination (RG = 0.0192 and 635 reflexions) yielded a framework structure, in which layers of octahedra 2[FeIIIF6/2] are connected via corners of [FeIIF4/2(H2O)2]-octahedra. The average distances in the nearly ideal octahedra are FeIII? F = 193.0, FeII? F = 208.1 and FeII? OH2 = 211.5 pm. |
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