title: Bis(4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole)diaquanickel(II) bis(perchlorate).
abstract: In the mol-ecular structure of the centrosymmetric mononuclear complex [Ni(2-bpt)(2)(H(2)O)(2)](ClO(4))(2) [2-bpt = 4-amino-3,5-di-2-pyridyl-1,2,4-triazole, (C(12)H(10)N(6))], the central Ni(II) atom is six-coordinated by a pair of chelating 2-bpt ligands and two water mol-ecules. Inter-molecular O-H⋯N inter-actions link the monomeric units into a two-dimensional hydrogen-bonded (4,4) network, which is extended to a three-dimensional supra-molecular aggregate via π⋯π stacking inter-actions [centroid-centroid distances 3.809 (3) and 3.499 (3)  Å].
authors.affiliation: College of Chemistry and Life Science, Tianjin Normal University, Tianjin 300387, People's Republic of China.
authors.forename: Chun-Fu
authors.initials: CF
authors.lastname: Shao
authors.forename: Li-Chuan
authors.initials: LC
authors.lastname: Geng