Synthesis, Characterization, and Electrochemical Study of Complexes with 4,4'-Bis(Salicylideneimino) Diphenyl ether and Cobalt(II), Copper(II), Zinc(II), and Cadmium(II)

摘要

The 4,4'-bis(salicyleneimino) diphenyl ether is a N_2O_3 Schiff base but it acts as a tetradentate ligand. Its complexes with cobalt (II), copper(II), zinc(II), and cadmium (D) were characterised using spectroscopic determinations, d.s.c. and cyclic voltam-metry. In these compounds, the coordination occurs through the non-ionised phenolic hydroxyl of the ligand and the nitrogen atom of the azomethine moiety. These new complexes should be formulated [CuVCl_2(H_2L)] centre dot H_2O, [(CoCl_2)_2(H_2L)(H_2O)_4] centre dot 2H_2O, [Zn_2Cl_2(H_2L)l and [Cd(H_2L)]O_2 respectively. The copper(II) and eadmiuni(II) complexes are mononuclear while the cobalt(II) and zinc(II) appeared to be binuclear species. The anodic oxidations of cobalt (II), zinc(II), and cadmium(II) com-pounds show only one peak attributed to the oxidation of the phenolic moiety of the ligand. In addition, the copper complex [CuCl_2(H_2L)] centre dot H_2O exhibits two peaks at +680 mV (ECS) and + 965mV (ECS) corresponding to the complexed couples Cu~II/Cu~III and Cu~I/Cu~II.