Propane-1,2-diaminium bis-(pyridine-2,6-dicarboxyl-ato-κO,N,O)mercurate(II) dihydrate.

In the title compound, (C(3)H(12)N(2))[Hg(C(7)H(3)NO(4))(2)]·2H(2)O, the Hg(II) ion is coordinated by four O and two N atoms of two pyridine-2,6-dicarboxyl-ate (pydc) ligands in a distorted octa-hedral environment. The structure contains two uncoordinated water mol-ecules. In the crystal, N-H⋯O, O-H⋯O and weak C-H⋯O hydrogen bonds and π-π stacking inter-actions between the pyridine rings of the pydc ligands, with a centroid-centroid distance of 3.4582 (18) Å, stabilize the structure.