Acta Cryst. (2013). C69, 330-333 [ doi:10.1107/S0108270113005969 ]
Abstract: The title compound, diiron(III) trisulfate-sulfuric acid-water (1/1/28), has been prepared at temperatures between 235 and 239 K from acid solutions of Fe2(SO4)3. Studies of the compound at 100 and 200 K are reported. The analysis reveals the structural features of an alum, (H5O2)Fe(SO4)2·12H2O. The Fe(H2O)6 unit is located on a centre of inversion at (, 0, ), while the H5O2+ cation is located about an inversion centre at (, , ). The compound thus represents the first oxonium alum, although the unit cell is orthorhombic.
Formula: Fe2(SO4)3·H2SO4·28H2O at 100 and 200 K
Structure factor file (CIF format) (85.8 kbytes)
Structure factor file (CIF format) (85.7 kbytes)
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