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

The title compound, [Cu(SO(4))(C(12)H(8)N(2))(2)]·C(4)H(10)O(2), is comprised of neutral monomeric complex and butane-2,3-diol solvent mol­ecules. In the complex, the Cu(II) ion is in a distorted square-pyramidal coordination environment defined by four N atoms from two chelating 1,10-phenanthroline ligands and one O atom from a monodentate sulfate anion; the O atom is at the apex. The two chelating N(2)C(2) groups subtend a dihedral angle of 85.8 (4)°. In the crystal, the neutral monomeric complex and butane-2,3-diol solvent mol­ecules are held together by O—H⋯O hydrogen bonding, which leads to additional stabilization of the structure. The presence of pseudosymmetry in the structure suggests the higher symmetry space group C2/c, but attempts to refine the structure in this space group resulted in an unsatisfactory model and high R and wR values. The sulfate anion is disordered over two sets of sites with occupancies of 0.55 (1) and 0.45 (1).