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In the title mononuclear complex, [Cu(NO 3 )(C 12 H 10 N 4 )(H 2 O)]NO 3 , the Cu II  ion assumes a distorted square-pyramidal geometry. There is a π–π stacking inter­action between the five-membered ring containing the Cu atom and a pyridine ring of a neighboring complex [centroid–centroid distance = 3.567 (2) Å and a perpendicular distance of 3.394 Å]. The crystal structure also contains inter­molecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds, linking cations and anions. In addition, there is a short inter­molecular contact [2.784 (6) Å] between an O atom of the coordinated nitrate group and its symmetry-related atom.

Aqua(2-hydrazino-1,10-phenanthroline)nitratocopper(II) nitrate