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TetraÂimidazolium piperazinediium bisÂ(benzene-1,3,5-tricarboxylÂate) dihydrate
During the crystallization of the title compound, 4C3H5N2
+·C4H12N2
+·2C9H3O6
3−·2H2O, the acidic protons were transferred to the imidazole and piperazine N atoms, forming the final 4:1:2:2 hydrated mixed salt. The mean planes of the three carboxylÂate groups in the anion are twisted with respect to the the central benzene ring, making dihedral angles of 13.5 (1), 14.5 (1) and 16.9 (1)°. In the crystal, the component ions are linked into a three-dimensional network by a combination of interÂmolecular N—H⋯O, O—H⋯O and weak C—H⋯O hydrogen bonds. Further stabilization is provided by Ï€-Ï€ stacking interÂactions with centroid–centroid distances of 3.393 (2) Å and weak C=O⋯π interÂactions [O–centroid = 3.363 (2) Å]
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