Crystal structure of tris(2-methyl-1 H -imidazol-3-ium) benzene-1,3,5-tricarboxylate

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The structure of the title salt, 3C 4 H 7 N 2 + ·C 9 H 3 O 6 3− ( 1 ), is reported. The compound is formed with three 2-methylimidazolium cations and a fully deprotonated trimesic acid. The structure is disordered over two orientations, which were refined using a split model (90.99: 9.01occupancy ratio). Analysis of bond distances and angles reveals the differences and similarities between compound 1 and the previously published 2-methyl-1 H -imidazol-3-ium 3,5-dicarboxybenzoate structure [Baletska et al. , (2023). Acta Cryst. E 79 , 1088–1092] and tris(2-methyl-1 H - imidazol-3-ium) 5-carboxybenzene-1,3-dicarboxylate 3,5-dicarboxybenzoate [Asprilla-Herrera et al. (2025). Acta Cryst. E 81 , 303–309], as well as the neutral counterparts of the ions [Tothadi et al. (2020). ACS Appl. Mater. Interfaces , 12 , 15588–15594; Hachuła et al. (2010). J. Chem. Crystallogr. 40 , 201–206]. The crystal packing analysis reveals the formation of hydrogen-bonded two-dimensional networks perpendicular to the [111] vector, where neighbouring planes interact via extensive π–π stacking.

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