N,N,N′,N′-Tetrakis(pyridin-4-yl)methanediamine monohydrate

In the title compound, C₂₁H₁₈N₆· H₂O, two 4,4′-dipyridyl-amine groups are linked by a methylene C atom, which sits on a twofold axis. The lattice water molecule is located slightly off a twofold axis, and is therefore disordered over two positions. In the crystal, the organic molecules and the water molecule are linked by O - H⋯N hydrogen bonds. The organic molecules exhibit extensive offset face-to-face π-π interactions to symmetry equivalents [centroid-centroid distances = 3.725 (3) and 4.059 (3) Å].