Acta Cryst. (2004). E60, i80-i81  [ doi:10.1107/S1600536804011900 ]

The ammonium chromium(III) alum NH₄Cr(SO₄)₂·12H₂O

N. Rempfer, H.-W. Lerner and M. Bolte

Abstract: The title compound, ammonium chromium(III) bis(sulfate) dodecahydrate, is composed of discrete NH₄⁺ cations, [Cr(H₂O)₆]³⁺ cations, SO₄^2- anions and water molecules. The Cr and N atoms are located on special positions of site symmetry ; the S atom and one of the O atoms bonded to it are located on a threefold rotation axis. The crystal packing is stabilized by several hydrogen bonds.

Online 5 June 2004

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