Triaqua(4-hydroxypyridine-2,6-dicarboxylato-κ³N,O,O′)zinc(II)–acetonitrile–water(1/0.25/1)

The title compound, [Zn(C7H2NO5)(H2O)3]·0.25CH3CN·H2O, was synthesized by the reaction of Zn(CH3COO)2·2H2O and chelidamic acid. The coordination geometry of the Zn atom is a distorted octahedron, with one N and two O atoms from the chelidamate ligand and three water O atoms. A three-dimensional network is formed by the O—H⋯O hydrogen bonds between the O atoms of the chelidamate ligand and the aqua ligands and water mol­ecule of crystallization.