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-N3-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.

► A centrosymmetric dinuclear azide bridged compound of formula [Cu(μ-N3)(N3)(bbmp)]2 is reported.
► The ligand 1,3-bis(benzimidazol-2-yl)-2-methylpropane binds chelating to Cu.
► The geometry of the dinuclear unit is in agreement with the antiferromagnetic behavior.