4,4′-Bipyridinium diaqua­bis(pyridine-2,5-dicarboxyl­ato-κ2 N, O2)zincate(II).

Hydro­thermal reaction of Zn(NO3)2·6H2O with pyridine-2,5-dicarboxylic acid, 4,4′-bipyridine and pyridine in a 1:1:1:2 molar ratio affords the title complex, (C10H10N2)[Zn(C7H3NO4)2(H2O)2], in which both ions are centrosymmetric. The ZnII atom is octahedrally coordin­ated by two pyridine-2,5-dicarboxyl­ate chelating ligands and two water mol­ecules in a distorted octa­hedral geometry. 4,4′-Bipyridinium, acting as counter-ion, has hydrogen-bonding inter­actions with pyridine-2,5-dicarboxyl­ate, forming a three-dimensional structure. [ABSTRACT FROM AUTHOR]