Supramolecular pseudopolymorphs: double helix and planar structures with channels

3,5-Dinitrobenzamide (DNBA) and 4,4′-bipyridyl (BP) co-crystallize to yield different types of channel structure from methanol and water, constituting supramolecular pseudopolymorphs. While, in the methanol adduct, DNBA and methanol molecules form a double helix network, in the water adduct, DNBA and water molecules yield a planar layer structure. However, in both the adducts, BP molecules sit in the channels created in the three-dimensional packing of the double helix or layers.