Synthesis, molecular structure and antioxidant activity of bis [L(μ-chloro)copper(II)] supported by phenoxy/naphthoxy-imine ligands.

A new series of Cu(II) complexes [bis[{(μ-chloro)-2-MeO-Ph-CH-(N=CH)-2,4-tert-butyl-2-OCH)}Cu(II)] (Cu1); bis[{(μ-chloro)-2-MeS-Ph-CH-(N=CH)-2,4-tert-butyl-2-(OCH)}Cu(II)] (Cu2); bis[{(μ-chloro)-2-MeO-Ph-CH-(N=CH)-2-(OCH)} Cu(II)] (Cu3); bis[{(μ-chloro)-2-MeS-Ph-CH-(N=CH)-2-(OCH)}Cu(II)] complex (Cu4); bis[{2-MeS-Ph-CH-(N=CH)-2,4-tert-butyl-2-(OCH)}Cu(II)] (Cu5)] have been synthesized and characterized by elemental analysis, IR, UV-Visible and by X-ray crystallography for Cu1, Cu4 and Cu5. In the solid state, Cu1 features of a chloro-bridged dimer complex with κ coordination of the monoanionic phenoxy-imine ligand onto the copper center. On the other hand, the molecular structure of Cu4 reveals the naphthoxy-imine ligand with pendant S-group coordinated to the copper atom in tridentate meridional fashion.