Co(II) and Cu(II) Schiff base complexes of bis(N-(4-diethylamino-2- methylphenyl)-3,5-di-tert-butylsalicylaldimine): Electrochemical and X-ray structural study

Abstract

Copper(II) and cobalt(II) complexes of salicylaldimine obtained by the condensation of N,N-diethyl-2-methyl-1,4-phenylenediamine with 3,5-di-tert-butyl-2-hydroxybenzaldehyde have been synthesized and characterized by elemental analyses, magnetic susceptibility measurements, cyclic voltammetry, and FT-IR and UV-Vis spectroscopy. The molecular structure of the title copper(II) complex was determined by the single crystal X-ray diffraction technique. The Cu(II) center is coordinated by four atoms of the donor set in a compressed tetrahedral trans-[N 2 O 2 ] environment, which can be essentially ascribed to the presence of bulky fragments of the ligand. The computed bond valences of the copper verify +2 oxidation state and indicate that the copper bonds, in particular Cu-N bonds, are elongated due to steric effects from bulky substituents in the ligands, N-(4-diethylamino-2-methylphenyl). Intermolecular C-H?? interactions leading to centrosymmetric synthons serve to stabilize periodic organization of the molecules. © 2008 Springer Science+Business Media, LLC.