Synthesis, structure, and magnetic properties of a tetranuclear copper(fII) complex with a triazenido ligand

The reaction of methyl anthranilate, sodium nitrite, and 2-aminopyridine produces a triazenide, namely, 1-[(2-carboxymethyl)benzene]-3-[2-pyridine]triazene (HL). In the presence of Et3N, the reaction of HL and CuCl2·2H2O gives a μ4-oxo-bridged tetranuclear copper(II) complex [Cu4OL3Cl3]·1.5THF (1·1.5THF), which has been characterized by X-ray crystallography and magnetic susceptibility measurements.