Bis(2,3-diaminopyridinium) succinate trihydrate

In the title salt, 2C5H8N3 +·C4H4O4 2−·3H2O, the asymmetric unit contains a protonated 2,3-diaminopyridinium cation, half of a succinate dianion (disposed about a centre of inversion), and one and a half water molecules. One of the water molecules is disordered over two sites with occupancies of 0.670 (17) and 0.330 (17). The other water molecule has an occupancy of 0.5 (from refinement). The pyridine N atom of the 2,3-diaminopyridine molecule is protonated. The protonated N atom and one of the 2-amino H atoms are hydrogen bonded to the succinate anion through a pair of N—H⋯O hydrogen bonds, forming an R 2 2(8) ring motif. In the crystal, molecules are consolidated into a three-dimensional network by N—H⋯O and O—H⋯O interactions.

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