Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 4 (April 2013)

inorganic compounds

Acta Cryst. (2013). C69, 330-333    [ doi:10.1107/S0108270113005969 ]

Fe2(SO4)3·H2SO4·28H2O, a low-temperature water-rich iron(III) sulfate

H. Schmidt, E. Hennings, P. Zürner and W. Voigt

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 ({1 \over 2}, 0, {1 \over 2}), while the H5O2+ cation is located about an inversion centre at ({1 \over 2}{1 \over 2}{1 \over 2}). 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

hkldisplay filedownload file

Structure factor file (CIF format) (85.8 kbytes)
[ doi:10.1107/S0108270113005969/ov3022I_100Ksup4.hkl ]
Contains datablock I_100K

hkldisplay filedownload file

Structure factor file (CIF format) (85.7 kbytes)
[ doi:10.1107/S0108270113005969/ov3022I_200Ksup5.hkl ]
Contains datablock I_200K


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