title: Crystal structure of μ-oxalodi-hydroxamato-bis-[(2,2'-bipyrid-yl)(di-methyl sulfoxide-κO)copper(II)] bis-(perchlorate).
abstract: The centrosymmetric binuclear complex, [Cu2(C2H2N2O4)(C10H8N2)2(C2H6OS)2](ClO4)2, contains two copper(II) ions, connected through an N-deprotonated oxalodi-hydroxamic acid dianion, two terminal 2,2'-bi-pyridine ligands, and two apically coordinating dimethylsulfoxide mol-ecules. Two non-coordinating perchlorate anions assure electrical neutrality. The copper(II) ions in the complex dication [Cu2(C10H8N2)2(μ-C2H2N2O4)(C2H6SO)2](2+) are in an O2N3 square-pyramidal donor environment, the Cu-Cu separation being 5.2949 (4) Å. Two hydroxamate groups in the deprotonated oxalodi-hydroxamic 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 mol-ecules along the a-axis direction.
authors.affiliation: O.O. Bohomolets National Medical University, Department of General Chemistry, Pr. Pobedy, 34, Kiev, 03055 , Ukraine.
authors.forename: Irina A
authors.initials: IA
authors.lastname: Odarich
authors.affiliation: Taras Shevchenko National University of Kiev, Department of Chemistry, Volodymyrska str. 62, Kiev, 01601 , Ukraine.
authors.forename: Anna V
authors.initials: AV
authors.lastname: Pavlishchuk
authors.affiliation: O.O. Bohomolets National Medical University, Department of General Chemistry, Pr. Pobedy, 34, Kiev, 03055 , Ukraine.
authors.forename: Valentina A
authors.initials: VA
authors.lastname: Kalibabchuk
authors.affiliation: University of Joensuu, Department of Chemistry, PO Box 111, FI-80101 Joensuu, Finland.
authors.forename: Matti
authors.initials: M
authors.lastname: Haukka
keywords: Cu(II) complex; crystal structure; oxalodi­hydroxamic acid