Synthesis and preparation of new tetra dentate macrocyclic ligand type N2S2 and metal complexes with di valence cobalte nickel and cupper and studying thermodynamic properties of complexes

Abstract

The macrocycle ligand type N2S2 have been prepared in through two steps . The first included the reaction between two equivalent of mercapto acetic acid and one equnivalent of ethylene di amine , the second included the reaction of first step precursor with penta erythritol tetra bromide , to obtained the target ligand . Co+2 , Ni+2 , Cu+2 from there action of the ligand Complexes were prepared with metal ions 1:2 ratio , the prepousd compounds were characterized by FT-IR , UV-Vis , NMR , C.H.N spectoscopies , mass spectra as well as the molar conductivity and magnetic successptibility , stability constant and mole ratio was corried out of prepared complexes these measurements shows the suggested geometry around the cobalt ion and cupper ion is distorted octahydral and tetrahydral around nickel ion . The effect of temperature on the stability constants were found to raising the Temperature . the thermodynamic function (∆G ,∆H ,∆S) of the formed complexes were calculated at range of temperature that showed complexes formation reaction was undo thermic and spontaneous .