A dinuclear end-on azide-bridged copper(II) compound with weak antiferromagnetic interaction-Synthesis, characterization, magnetism and X-ray structure of bis[(μ-azido-κN1)-(azido-κN1)(1,3-bis(benzimidazol- 2-yl)-2-methylpropane)copper(II)]

The centrosymmetric dinuclear compound of formula [Cu(μ-N 3-κN1)(N3-κN1)(bbmp)]2 is reported. Synthesis, characterization, physical properties are determined in detail, together with its 3D structure. The dinuclear end-on azide-bridged copper(II) compound displays a weak antiferromagnetic interaction, despite the fact that the magnetic orbitals overlap. The Cu-Cu contact distance is 3.1867(8) Å, while the Cu-Nazide-Cu angle is 103.41(14)°. The IR spectra of the azido ligands are as expected for such coordinated azides. © 2012 Elsevier B.V. All rights reserved.The work described in this paper was supported by the Leiden University Study group WFMO (Werkgroep Fundamenteel MaterialenOnderzoek). JR thanks King Saud University for a Distinguished Scientist Fellowship.Peer Reviewe