Tris(1,10-phenanthroline)nickel(II) dichromate tetra­hydrate

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 mol­ecules, 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 octa­hedral geometry. The [Cr(2)O(7)](2−) anion exhibits a staggered conformation. The crystal packing is stabilized by inter­molecular O—H⋯O hydrogen bonds and π–π inter­actions, evidenced by short distances of 3.531 (5) Å between the centroids of aromatic rings.