Synthesis and characterization of some new mononuclear complexes of Co(II), Ni(II), Cu(II) and Zn(II) with N2S2 donor Schiff base ligands

Two new tetradentate ligands (L1 and L2) N,N'-bis {(o-aminophenylthio)bromo propyl} 1-phenyl butane 1,3-dilidene (L1), N, N'-bis (3bromo propyl (phenylthio) imino)1,1,1-trifluoro -3-(2-theonyl) acetone (L2) were prepared from the reaction of equimolar amount of (o-aminophenylthio) propylebromide and benzoylacetone or 2theonyltrifluoro acetone in (2:1) molar ratio. Reaction of the above ligands with cobalt(II), nickel(II), copper (II) and zinc(II) chloride salts gave the complexes of the general formulas: [M(L)]Cl2 and [Zn(L)Cl2], M= Co(II), Ni(II), Cu(II) and Zn(II), L= L1-L2. The synthesized ligands and their complexes were characterized by their elemental analysis FTIR, UV-Vis, metal content, conductivity measurement and magnetic measurement. On the basis of these studies at four coordinate tetrahedral geometry around the metal ion has been proposed and the ligands behave us tetradentate from nitrogen atoms of the azomthine and two sulfur atoms while for zinc (II) complexes from the two sulfur atoms and two chloride ions.