| Summary: | In the title binuclear complex, [Cu2(NO3)3(C18H16N6Se)(H2O)3]NO3·H2O, the CuII ions are pentacoordinated in a tetragonal–pyramidal geometry. In both cases, the equatorial planes are formed by a chelating pyrazole-pyridine group, a water molecule and a nitrate O atom, whereas the apical positions are occupied by a water molecule for one CuII ion and a nitrate O atom for the other. The organic selenide ligand adopts a trans configuration with respect to the C–Se–C plane. Numerous intermolecular O—H...O and N—H...O hydrogen bonds between the coordinating and lattice water molecules, nitrate anions and pyrazole groups are observed. π–π stacking interactions between the pyridine rings [averaged centroid–centroid distance = 3.652 (5) Å] are also present. The lattice water molecule is equally disordered over two sets of sites.
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