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In the molecular structure of the centrosymmetric mononuclear complex [Ni(2-bpt)2(H2O)2](ClO4)2 [2-bpt = 4-amino-3,5-di-2-pyridyl-1,2,4-triazole, (C12H10N6)], the central NiII atom is six-coordinated by a pair of chelating 2-bpt ligands and two water molecules. Intermolecular O—H...N interactions link the monomeric units into a two-dimensional hydrogen-bonded (4,4) network, which is extended to a three-dimensional supramolecular aggregate via π...π stacking interactions [centroid–centroid distances 3.809 (3) and 3.499 (3) Å].