Bis(26-diamino­pyridinium) bis­(hydrogen oxalate) monohydrate

摘要

The asymmetric unit of the title compound, 2C5H8N3 ⁺·2C2HO4 ⁻·H2O, contains two crystallographically independent 2,6-diamino­pyridinium cations, a pair of hydrogen oxalate anions and a water mol­ecule. Both 2,6-diamino­pyridinium cations are planar, with maximum deviations of 0.011 (2) and 0.015 (1) Å, and are protonated at the pyridine N atoms. The hydrogen oxalate anions adopt twisted conformations and the dihedral angles between the planes of their carboxyl groups are 31.01 (11) and 63.48 (11)°. In the crystal, the cations, anions and water mol­ecules are linked via O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional network.