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The title compound, [Ni(C 8 H 3 NO 6 )(C 12 H 8 N 2 )(H 2 O)], contains an Ni II  ion, a 1,10-phenanthroline (phen) ligand, a 4-carb­oxy­pyridine-2,6-dicarboxyl­ate (Hptc 2− ) anion and a coordinated water mol­ecule. The Ni II  atom exhibits a distorted octa­hedral N 3 O 3  environment. O—H⋯O hydrogen bonding between coordinated water and carboxyl­ate O atoms, as well as π–π stacking inter­actions [inter­planar distances between phen rings = 3.293 (2) Å] lead to a supermolecular assembly.

acta crystallographica. section e

Aqua(4-carboxypyridine-2,6-dicarboxylato-κ3O2,N,O6)(1,10-phenanthroline-κ2N,N′)nickel(II)