trans-Diaqua-bis-[5-(pyridine-3-carboxamido)-tetra-zolido-κ(2)O,N(1)]zinc dihydrate.

The title compound, [Zn(C(7)H(5)N(6)O)(2)(H(2)O)(2)]·2H(2)O, consists of one Zn(II) ion located on the crystallographic inversion centre, two 5-(pyridine-3-carboxamido)-tetra-zolide ligands, two coordinated water mol-ecules and two free water mol-ecules. The Zn(II) ion adopts a slightly distorted octa-hedral coordination geometry formed by the N,O-chelating ligands and two O water atoms. The pyridine N atoms are not coordinated. In the crystal, complex mol-ecules are connected by N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds, forming a three-dimensional network.