Synthesis and Characterization of NewSchiff Base Ligand Derived from 4 – aminoantipyrine and it’s complexeswith some Metal Ions and Their AntibacterialStudy

Abstract

Metal complexes of Schiff base ligand(L), prepared via condensation of 4−aminoantipyrine and benzil, are prepared. The ligand is characterized based on elemental analysis , IR, electronic spectrum , 1HNMR along with melting point. Metal complexes are reported and characterized based on elemental analysis , IR , electronic spectra , magnetic moment , molar conductance , 1HNMR (for zinc complex only) and chloride content along with mole ratio method and melting point . From the elemental analyses and mole ratio method , 1 : 2 metal : ligand for Mn(II) and Cu(II) complexes and 1:1 metal : ligand for Zn(II) and Cd(II) complexes, are found with molecular formula :[Mn (L)2Cl2]. H2O, [Cu(L)2(H2O)Cl ]Cl, [Zn(L)Cl2]. H2O and [Cd (L)Cl2] . From the IR results , we suggested that the ligand (L) behaves as bidentate on complexation with metal ions via the azomethine nitrogen and carbonyl oxygen atom of five member ring of the ligand .The electronic spectral data and magnetic measurements indicate that the complexes exhibit octahedral geometry around Mn(II) and Cu(II) while tetrahedral geometry around Zn(II) and Cd(II) . The results of antibacterial activity showed that only Cd(II) complex have a high activity (22mm) for Eschirichia coli .