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In the title compound, [Cu(C 13 H 8 N 4 O 3 )(H 2 O)]·3H 2 O, the complex molecule, except for the aqua ligand, is essentially planar [r.m.s. deviation = 0.034 (2) Å]. The coordination polyhedron of the Cu 2+  cation is a square-pyramid, with the aqua ligand at the apex. The compound exhibits a three-dimensional structure, which is is stabilized by O—H⋯O and O—-H⋯N hydrogen bonds and π–π inter­actions [centroid–centroid distance = 2.987 (3) Å].

Aqua[6-carboxylato-N′-(pyridin-2-ylmethylidene)pyridine-2-carbohydrazidato]copper(II) trihydrate