Synthesis and Reactivity of 1-[(2-methoxy)benzene]- 3-[benzothiazole]Triazene With Copper(II) or Cobalt(II) Chloride

A new triazene, 1-[(2-methoxy)benzene]-3-[benzothiazole] triazene (HL), has been synthesized and charaterized. In the presence of Et3N, the reaction of HL and CuCl2·2H2O or CoCl2·6H2O gives the triazenide complexes [Cu4L′4(μ-OMe)4] 1 (L′ 1-[benzothiazole]triazene ion) and [Co2L4] 2, respectively. The X-ray crystal structures of both complexes have been obtained. Magnetic studies indicate significant antiferromagnetic coupling between the copper(II) centers or cobalt(II) centers for complexes 1 and 2, with coupling constants (J) of –587 cm−1 for 1 and –147 cm−1 for 2. Complex 2 shows one reversible one-electron redox wave at –0.835 V, and one irreversible oxidation at –0.193 V, which are in accord with the redox potentials of [CoIII-CoII]/[CoII-CoII] and [CoIII-CoIII]/[CoII-CoII] couples, respectively.