organic compounds
The title compound, C15H11N3O3·2H2O, crystallizes with terpyridine dioxide molecules positioned on mirror planes in the space group Pnma. Catemeric assemblages of terpyridine molecules [C—H−O—+N = 3.386 (4) Å] are linked by bridging water molecules [C—HO = 3.288 (4) and 3.386 (4) Å; O—H−O—+N = 2.837 (3) and 2.878 (4) Å], giving stacks of two-dimensional undulating motifs.