Synthesis and characterization of selected copper (II) macrocyclic complexes

Abstract

In this study the template synthesis and characterization of metal ion complexes of Cu (II) are presented. New 16‐membered tetraaza macrocyclic complexes of the type [M (C8H16N8O4) (ClO4)2], [M (C10H20N8O4)(ClO4)2 ], [M (C20H24N8O4) (ClO4)2], where, M is Cu (II) were synthesize by the template condensation of formaldehyde, acetaldehyde, benzaldehyde with the corresponding hydrated metal salts of CuCl2.2H2O in aqueous medium. These complexes were distinctly colored and stable to atmospheric conditions. These complexes were characterized by UV‐Vis, IR as well as by measurements of their respective molar conductance and magnetic susceptibility. The low molar conductance values obtained in DMSO for these complexes indicated their non electrolyte nature. Furthermore, from their magnetic susceptibility values, UVVis spectra and FTIR spectra, these newly prepared complexes were expected to have octahedral geometry, with the respective Cu (II) ion occupying the center of an octahedron. The complexes [Cu(C8H16N8O4)(ClO4)2], [Cu(C10H20N8O4)(ClO4)2], [Cu(C20H24N8O4)(ClO4)2], were prepared by the reaction of malonodihydrazide with cupper(II) perchlorate hexahydrate in presence of different aldehyde i.e. formaldehyde, acetaldehyde, benzaldehyde respectively in 2:1:2 molar ratio.