Tetraimidazolium piperazinediium bis(benzene-1,3,5-tricarboxylate) dihydrate

During the crystallization of the title compound, 4C3H5N2+·C4H12N2+·2C9H3O63−·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 carboxylate 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 intermolecular N—H...O, O—H...O and weak C—H...O hydrogen bonds. Further stabilization is provided by π-π stacking interactions with centroid–centroid distances of 3.393 (2) Å and weak C=O...π interactions [O–centroid = 3.363 (2) Å].

Abstract licence: CC BY

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