New one-pot synthetic route and spectroscopic characterization of dinuclear triple carboxylatobridged cuii complexes of the polypyridyl ligands

Abstract

This paper describe a new one-pot synthetic route for the preparation of dinuclear triple carboxylato-bridged copper(II) complexes  incorporating polypyridyl ligands. The ligands utilized were 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen), and dipyrido[3,2-a:2′,3′- c]phenazine (dppz). Reaction of these ligands with copper(II) nitrate and acetylated lincomycin under mild conditions serendipitously  yielded the complexes: [Cu₂(bpy)₂(CH₃COO)(OH)(H₂O)](NO₃)₂, [Cu₂(phen)₂(CH₃COO)(OH)(H₂O)](NO₃)₂ and [Cu₂(dppz)₂(CH₃COO) (OH)(H₂O)](NO₃)₂. The complexes were characterized by FTIR spectroscopy and elemental analysis (C, H, N), while the structure of  complex 1 was confirmed via singlecrystal X-ray crystallography. The X-ray analysis revealed a dinuclear core with a triple carboxylato  bridge, confirming the proposed coordination geometry. The synthetic method highlights the role of acetylated lincomycin as a unique  reagent in facilitating the formation of these dinuclear copper complexes. The findings underscore the potential of these complexes for  further exploration in catalysis, molecular magnetism, and biomimetic chemistry.