Aqua-(4-nitro-phthalato)bis-[2-(1H-pyrazol-3-yl)pyridine]-zinc(II) hemihydrate.

In the title compound, [Zn(C(8)H(3)NO(6))(C(8)H(7)N(3))(2)(H(2)O)]·0.5H(2)O, the Zn(II) atom shows a distorted octa-hedral ZnN(4)O(2) coordination environment and is bonded to two 3-(2-pyrid-yl)-1H-pyrazole ligands via the N atoms, one monodentate 4-nitro-phthalate ligand and one associated water mol-ecule. Additionally, one water of crystallization, with a site-occupation factor of 0.5, is present. The two 3-(2-pyrid-yl)-1H-pyrazole ligands are planar [r.m.s. deviations = 0.03 (1) and 0.35 (1) Å] and the dihedral angle between the two planar 3-(2-pyrid-yl)-1H-pyrazole ligands is 67.31 (4)°. Inter-molecular π-π stacking inter-actions between 3-(2-pyrid-yl)-1H-pyrazole ligands with a face-to-face separation of 3.64 (1) Å are observed. Moreover, the crystal structure is stabilized by O-H⋯O and N-H⋯O hydrogen bonds between the water of crystallization, the associated water mol-ecule and the 3-(2-pyrid-yl)-1H-pyrazole ligands.