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The co-crystal of succinic acid with imidazolidin-2-one was mechanochemically prepared and its structure was studied by powder and single-crystal X-ray diffraction. This compound crystallizes in the triclinic system with space group P-1. The molecular structure and crystal packing are stabilized mainly by intermolecular O--H···O and N--H···O hydrogen bonds interactions, forming a supramolecular assembly with bidimensional hydrogen bond networks along the [110] diagonal joined by C 4 4(22) chains and R2 2(8) amide-acid dimers which running along the ba plane. These hydrogen bonds contribute to the stabilization of the crystal structure that packs with an efficiency of 69.1 % in a planar sheet structure similarly to the even diacid co-crystals containing imidazolidin-2-one. Hirshfeld surface analysis was used for visually analyzing intermolecular interactions in the crystal structure.

The title compound has been synthesized by grinding in an agate mortar. Its structure was characterized by TGA-DSC studies and single-crystal X-ray diffraction. This compound crystallize in the monoclinic system with space group C2/c, Z = 4, and unit cell parameters a = 16.109(2) Å, b = 5.748(7) Å, c = 20.580(3) Å, β = 107.36(1)°. The salt, C2HO4-.C5H7N+.0.5 H2O, is an ionic ensemble assisted by hydrogen bonds established between 4-aminopyridinium cations, oxalate anions and water molecules. The three components thus construct a supramolecular assembly with a three-dimensional hydrogen bonded framework.