title: Tris(1,10-phenanthroline)nickel(II) dichromate tetra-hydrate.
abstract: The asymmetric unit of the title compound, [Ni(C(12)H(8)N(2))(3)][Cr(2)O(7)]·4H(2)O, contains one cation, one anion and four water mol-ecules, three of which are disordered over two sites with equal occupancies. In the cation, the metal centre is coordinated by six N atoms from three 1,10-phenanthroline ligands in a distorted octa-hedral geometry. The [Cr(2)O(7)](2-) anion exhibits a staggered conformation. The crystal packing is stabilized by inter-molecular O-H⋯O hydrogen bonds and π-π inter-actions, evidenced by short distances of 3.531 (5) Å between the centroids of aromatic rings.
authors.affiliation: College of Chemistry and Chemical Engineering, Microscale Science Institute, Weifang University, Weifang 261061, People's Republic of China.
authors.forename: Hai-Xing
authors.initials: HX
authors.lastname: Liu