Crystal structure of 1,4-bis­(3-ammonio­prop­yl)piperazine-1,4-diium bis­[dichromate(VI)]

The asymmetric unit of the organic–inorganic title salt, (C(10)H(28)N(4))[Cr(2)O(7)](2), comprises one half of an 1,4-bis­(3-ammonio­prop­yl)piperazinediium cation (the other half being generated by the application of inversion symmetry) and a dichromate anion. The piperazine ring of the cation adopts a chair conformation, and the two CrO(4) tetra­hedra of the anion are in an almost eclipsed conformation. In the crystal, the cations and anions form a layered arrangement parallel to (001). N—H⋯O hydrogen bonds between the cations and anions and additional C—H⋯O inter­actions lead to the formation of a three-dimensional network structure.