[Di­aqua­sesqui(nitrato-κO)hemi(perchlorato-κO)copper(II)]-μ-{bis­[5-methyl-3-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide}-[tri­aqua­(perchlorato-κO)copper(II)] nitrate monohydrate

In the binuclear title complex, [Cu(2)(ClO(4))(1.5)(NO(3))(1.5)(C(18)H(16)N(6)Se)(H(2)O)(5)]NO(3)·H(2)O, both Cu(II) ions are hexa­coordinated by O and N atoms, thus forming axially elongated CuO(4)N(2) octa­hedra. The equatorial plane of each octa­hedron is formed by one chelating pyrazole–pyridine fragment of the organic ligand and two water mol­ecules. The axial positions in one octa­hedron are occupied by a water mol­ecule and a monodentately coordinated perchlorate anion, while those in the other are occupied by a nitrate anion and a disordered perchlorate/nitrate anion with equal site occupancy. The pyrazole–pyridine units of the organic selenide are trans-oriented to each other with a C—Se—C angle of 96.01 (14)°. In the crystal, uncoordinated nitrate anions and the coordinating water mol­ecules are involved in O—H⋯O and N—H⋯O hydrogen bonds, forming a bridge between the pyrazole group and the coordinating water mol­ecules. Further O—H⋯O hydrogen bonds between the complex mol­ecules and a π–π stacking inter­action with a centroid–centroid distance of 3.834 (4) Å are also observed.