title: Tris(1,10-phenanthroline-κN,N')nickel(II) dinitrate tetra-hydrate.
abstract: In the title complex, [Ni(C(12)H(8)N(2))(3)](NO(3))(2)·4H(2)O, the Ni(II) ion is octa-hedrally coordinated by three bidentate 1,10-phenanthroline ligands, each forming a five-membered chelate ring. In the crystal, O-H⋯O and C-H⋯O hydrogen bonds are present between the complex cations, nitrate anions and water mol-ecules. O-H⋯O hydrogen bonds between the uncoord-inated water mol-ecules lead to the formation of a four-membered ring water cluster, with a planar configuration. There were an additional five grossly disordered water mol-ecules in the asymmetric unit, which were removed by the subroutine SQUEEZE; these were were excluded in the calculation of the molecular weight, etc. π-π stacking inter-actions between the aromatic rings are also observed [centroid-centroid distances = 3.697 (2), 3.728 (2) and 3.761 (2) Å].
authors.forename: Masoumeh
authors.initials: M
authors.lastname: Tabatabaee
authors.forename: Nikoo
authors.initials: N
authors.lastname: Zaji
authors.forename: Masood
authors.initials: M
authors.lastname: Parvez