Structural and electrochemical studies of Co(II), Ni(II), Cu(II) and Cd(II) complexes with a new symmetrical N2O2 Schiff base: Crystal structure of the ligand 1,2-di[4-(2-imino 4-oxo pentane)phenyl]ethane

The crystal structure of a new Schiff base: 1,2-di[4-(2-imino 4-oxo pentane)phenyl]ethane (H2L) is described. This molecule undergoes tautomerism with three tautomers: keto-imine, enol-imine and keto-amine. It acts mainly as a tetradentate ligand. Its complexes with cobalt(II), nickel(II), copper(II) are characterised using spectroscopic determinations and cyclic voltammetry. These new complex species are formulated as [CoL] · (H2O)3, [(NiCl2)2(H2L)], [CuCl2(H2L)] and [CdCl2(H2L)], respectively. The coordination occurs through the N2O2 system, using various tautomers.

Graphical abstractThe crystal structure of 1,2-di[4-(2-imino 4-oxo pentane)phenyl]ethane (H2L) is described. This new tetradentate Schiff base gives complexes with cobalt(II), nickel(II), copper(II) and cadmium(II). These new complex species are formulated as [CoL] · (H2O)3, [(NiCl2)2(H2L)], [CuCl2(H2L)] and [CdCl2(H2L)], respectively. The coordination occurs through the N2O2 system, using various tautomers. In addition, their cyclic voltammograms are discussed.Figure optionsDownload full-size imageDownload as PowerPoint slide