Acta Cryst. (2013). E69, i13
[ doi:10.1107/S1600536813001608 ]
Abstract: The crystal structure of (H3O)2Cr4O13 is isotypic with K2Cr4O13. The finite tetrachromate anion in the title structure consists of four vertex-sharing CrO4 tetrahedra and exhibits a typical zigzag arrangement. The crystal packing is stabilized by hydrogen bonds between these anions and hydronium cations. The two different hydronium cations are surrounded by nine O atoms of tetrachromate anions, with OO distances ranging between 2.866 (8) and 3.282 (7) Å.
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