data reports
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The title salt, C3H5N2+·C10H6NO4−, was obtained during a study of the co-crystallization of N′-[bis(1H-imidazol-1-yl)methylene]isonicotinohydrazide with (1,3-dioxoisoindolin-2-yl)acetic acid under aqueous conditions. The 1,3-dioxoisoindolinyl ring system of the anion is essentially planar [maximum deviation = 0.023 (2) Å]. In the crystal, cations and anions are linked via classical N—HO hydrogen bonds and weak C—HO hydrogen bonds, forming a three-dimensional network. Weak C—Hπ interactions and π–π stacking interactions [centroid–centroid distances = 3.4728 (13) and 3.7339 (13) Å] also occur in the crystal.