Synthesis, structural characterization and electrochemical studies of an ionic cobalt complex derived from a tridentate hydrazone Schiff base and azide ligands

Abstract

The first Co(III)/Co(III) ionic complex with hydrazone and azide ligands, [Co(L) 2 ] + [Co(L)(N 3 ) 3 ] − ∙ CH 3 OH, was structurally and electrochemically characterized, where HL = N ′-[(1 E )-1-pyridin-2-ylethylidene]-2-furohydrazide. In the cation [Co(L) 2 ] + two furanhydrazone, each of them with the three donor atoms, constitute a meridional arrangement around the cobalt atom. The coordination polyhedra are a CoO 2 N 4 distorted octahedron for cation and a CoON 5 distorted octahedron for anion. Cyclic voltammetric experiments of the [Co(L) 2 ] + [Co(L)(N 3 ) 3 ] − in DMSO reveal reduction of the L ligand at − 1.56 V and two reduction potentials at − 0.81 and − 1.28 V for two different Co(III). The first Co(III)/Co(III) ionic complex with hydrazone and azide ligands, [Co(L)] + [Co(L)(N)] – ∙ CH 3 OH, was structurally and electrochemically characterized, where HL = N ′-[(1 E )-1-pyridin-2-ylethylidene]-2-furohydrazide. ▶ The first Co(III)/Co(III) ionic complex with hydrazone and azide ligands is reported. ▶ In the cation two furanhydrazone constitute a meridional arrangement around the cobalt atom. ▶ Voltammetric study of the complex show the reduction of ligand and two Co(III).