Acta Cryst. (2012). E68, m1472-m1473 [ doi:10.1107/S1600536812045217 ]
Abstract: 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-HO and N-HO hydrogen bonds between the coordinating and lattice water molecules, nitrate anions and pyrazole groups are observed. - 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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