Synthesis, characterization and crystal structure of a binuclear copper(II) diethylenetriamine complex bridged through a centrosymmetric 1,3-μ-thiocyanato group

The binuclear copper(II) complex [Cu-2(dien)(2)(NCS)(2)](ClO4)(2), where dien = diethylenetriamine, has been synthesized and characterized by analysis, infrared (IR) and electron paramagnetic resonance (EPR) spectra. A centrosymmetric axial-equatorial 1,3-mu-NCS bridged binuclear copper(II) complex has been identified by X-ray diffraction, in which each copper(II) is five-coordinated with an elongated square pyramidal geometry with four nitrogen atoms on its basal plane and one sulfur atom at the apical position. Frozen solution EPR spectra at 77 K indicate that the interaction between the two copper centers is weak and the bridge is retained in solution.