Synthesis, characterization and liquid-liquid extraction properties of new methoxyaminobiphenylglyoxime derivatives and their complexes with some transition metals

Abstract

In this study, three new aminobiphenylglyoximes, [L1H 2] N-(2-methoxy)aminobiphenylglyoxime, [L2H2] N-(3-methoxy)aminobiphenylglyoxime and L[3H2] N-(4-methoxy)aminobiphenylglyoxime have been synthesized by the reaction of (E,E)-4'-biphenylchloroglyoxime with 2-Methoxyaniline, 3-Methoxyaniline and 4-Methoxyaniline in absolute ethanol. The preparation NiII, CoII and CuII complexes of these ligands are described. The ligands and their complexes were characterized by elemental analyses, IR, mass, H1 and 13C NMR spectra, thermogravimetric analyses (t.g.a) and magnetic susceptibility measurements. Ligands complexing properties were studied by the liquid-liquid extraction of selected alkali (Li+, Na+, K+, Cs+) and transition metals (Co 2+, Ni2+, Cu2+, Zn2+, Cd 2+, Pb2+). It has been observed that all ligands show a high affinity to Cu2+ ions, whereas almost no affinity to alkali metals. The extraction equilibrium constants (K ex) for complexes of ligands with Cu2+ metal picrates between dichloromethane and water have been determined at 25°C. © 2007 Springer.