Crystal structure of μ-oxalodi­hydroxamato-bis­[(2,2′-bipyrid­yl)(di­methyl sulfoxide-κO)copper(II)] bis­(perchlorate)

The centrosymmetric binuclear complex, [Cu(2)(C(2)H(2)N(2)O(4))(C(10)H(8)N(2))(2)(C(2)H(6)OS)(2)](ClO(4))(2), contains two copper(II) ions, connected through an N-deprotonated oxalodi­hydroxamic acid dianion, two terminal 2,2′-bi­pyridine ligands, and two apically coordinating dimethylsulfoxide mol­ecules. Two non-coordinating perchlorate anions assure electrical neutrality. The copper(II) ions in the complex dication [Cu(2)(C(10)H(8)N(2))(2)(μ-C(2)H(2)N(2)O(4))(C(2)H(6)SO)(2)](2+) are in an O(2)N(3) square-pyramidal donor environment, the Cu–Cu separation being 5.2949 (4) Å. Two hydroxamate groups in the deprotonated oxalodi­hydroxamic acid are located trans to one each other. In the crystal, O—H⋯O and C—H⋯O hydrogen bonds link the complex cations to the perchlorate anions. Further C—H⋯O hydrogen bonds combine with π–π contacts with a centroid-to-centroid separation of 3.6371 (12) Å to stack the mol­ecules along the a-axis direction.