Cu(II), Ni(II), and Co(II) Complexes of Tetradentate Azomethine Ligands: Chemical and Electrochemical Syntheses, Crystal Structures, and Magnetic Properties

Abstract

Complexes CuL¹ ⋅ MeOH (Ia), NiL¹ ⋅ MeOH (Ib), CоL¹ ⋅ MeOH (Ic), CuL² (IIa), NiL² (IIb), and CоL² (IIc) of the tetradentate azomethine compounds, namely, 4-methyl-N-[2-[(E)-2-[2-[2-[(E)-[2-(p-toluenesulfamino)phenyl]methyleneamino]ethoxy]ethyliminomethyl]phenyl]benzenesulfamide (H₂L¹) and 4-methyl-N-[2-[(E)-3-[4-[3-[(E)-[2-(p-toluenesulfamino)phenyl]methyleneamino]propoxy]butoxy]-propyliminomethyl]phenyl]benzenesulfamide (H₂L²), which are the condensation products of 2-(N-tosylamino)benzaldehyde with 3,4-dioxa-1,8-octanediamine and 4,9-dioxa-1,12-dodecanediamine, are synthesized using the chemical and electrochemical methods. The structures, compositions, and properties of the synthesized metal complexes are studied by the methods of elemental analysis, IR spectroscopy, X-ray absorption spectroscopy, magnetochemistry, and X-ray diffraction analysis (СIF files CCDC nos. 1910746 (Ia), 1910747 (Ib), and 1910748 (Ic)). In the molecules of compounds Ia–Ic, the L¹ macrocyclic ligand coordinates the metal atom by four nitrogen atoms via the tetradentate chelate mode to form the polyhedron as a distorted tetrahedron.