Aqua-[6-carboxyl-ato-N'-(pyridin-2-yl-methyl-idene)pyridine-2-carbohydrazidato]copper(II) trihydrate.

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 inter-actions [centroid-centroid distance = 2.987 (3) Å].