Acta Cryst. (2012). E68, m1472-m1473
[ doi:10.1107/S1600536812045217 ]

[Aquabis(nitrato-O)copper(II)]--{bis[5-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl]selenide}-[diaqua(nitrato-O)copper(II)] nitrate monohydrate

M. Seredyuk, V. A. Pavlenko, E. Gumienna-Kontecka and T. S. Iskenderov

Abstract: In the title binuclear complex, [Cu₂(NO₃)₃(C₁₈H₁₆N₆Se)(H₂O)₃]NO₃·H₂O, the Cu^II 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 Cu^II 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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