Bis(guanidinium) tris-(pyridine-2,6-dicarboxyl-ato-κ(3)O(2),N,O(6))zirconate(II) tetra-hydrate.

In the title complex, (CH(6)N(3))(2)[Zr(C(7)H(3)NO(4))(3)]·4H(2)O, the Zr(IV) ion lies on a twofold rotation axes and is coordinated by six O and three N atoms of three tridentate pyridine-2,6-dicarboxyl-ate ligands, forming a slightly distorted tricapped trigonal-prismatic geometry. In the crystal, O-H⋯O and N-H⋯O hydrogen bonds link the components into a three-dimensional network.