Hydroxonium hydrate tris(2,4,6‐triamino‐1,3,5‐triazin‐1‐ium) bis[bis(pyridine‐2,6‐dicarboxylato)manganate(II/III)] hydroxide pyridine‐2,6‐dicarboxylic acid solvate pentahydrate

For charge balance in the title compound, (H₅O₂)(C₃H₇N₆)₃Mn(C₇H₃NO₄)₂]₂(OH)·C₇H₅NO₄·5H₂O, it is assumed that the metal atom site is disordered Mn^II/Mn^III, probably due to partial air oxidation of the starting Mn^II species. The formula unit of the complex contains a hydroxonium hydrate cation, H₅O₂⁺, also known as the Zundel cation, with twofold symmetry. The O...O 2.445 (10) Å] and O...H distances 1.24 (2) Å] in the H₅O₂⁺ cation indicate a strong hydrogen bond. In addition, there is a hydroxide ion that is disordered with respect to a twofold rotation axis. One of the melaminium groups and the pyridine‐2,6‐dicarboxylate (pydc) ligand also reside on crystallographic twofold axes. The coordination environment of the Mn ion is distorted octahedral. Three intermolecular C=O...π interactions are observed, with distances of 3.536 (4), 3.262 (4) and 3.750 (4) Å between carboxylate C=O groups and the centroids of the aromatic rings of pydc and melaminium. There are numerous O—H...O, O—H...N, N—H...O, N—H...N and C—H...O hydrogen bonds. Most of the components of the structure are organized into one plane.