Bis(1,10-phenanthroline-κ(2) N,N′)(sulfato-κ(2) O,O′)nickel(II) butane-2,3-diol monosolvate

In the title compound, [Ni(SO(4))(C(12)H(8)N(2))(2)]·C(4)H(10)O(2), the Ni(II) ion is six-coordinated by four N atoms from two chelating 1,10-phenanthroline ligands and two O atoms from an O,O′-bidentate sulfate anion, resulting in a distorted octa­hedral geometry for the metal ion. The dihedral angle between the two chelating N(2)C(2) groups is 83.82 (12)°. The Ni(II) ion, the S atom and the mid-point of the central C—C bond of the butane-2,3-diol solvent mol­ecule lie on a twofold rotation axis. In the crystal, the complex mol­ecules and solvent mol­ecules are held together by pairs of symmetry-related O(diol)—H⋯O(sulfate) hydrogen bonds involving the uncoordinating O atoms of the sulfate ions. The solvent mol­ecule is disordered over two sets of sites with site occupancies of 0.450 (9) and 0.550 (9).