Diaqua­bis­(1,10-phenanthroline-κ(2) N,N′)cadmium sulfate hexa­hydrate

The title compound, [Cd(C(12)H(8)N(2))(2)(H(2)O)(2)]SO(4)·6H(2)O, was obtained unexpectedly during an attempt to synthesize a cadmium complex with bidentate bridging sulfate ligands via hydro­thermal synthesis. The Cd(II) metal ion is six-coordinated by two chelating 1,10-phenanthroline ligands and two water mol­ecules, resulting in a distorted octa­hedral geometry for the metal ion. The two chelating N(2)C(2) groups are almost perpendicular to each other [dihedral angle = 86.75 (2)°]. In the crystal, the [Cd(C(12)H(8)N(2))(2)(H(2)O)(2)](2+) complex cations join with the sulfate anions through two O(water)—H⋯O(sulfate) hydrogen bonds. These ion pairs are further inter­linked into a two-dimensional supermolecular structure via additional O—H⋯O hydrogen bonds.