Abstract

SYNTHESIS AND CHARACTERIZATION OF MIXED LIGAND COMPLEXES OF 1-[(1E)-N-(4-BROMO-3-ETHOXYPHENYL) ETHANIMIDOYL]NAPHTHALEN-2-OL AND 4-BROMO-2-{(E)-[(2- METHYL-5-NITROPHENYL)IMINO]METHYL}PHENOL TRANSITION METAL(II) IONS.

Atmaram K. Mapari*

ABSTRACT

The mixed ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Schiff bases 1-[(1E)-N-(4-bromo-3-ethoxyphenyl)ethanimidoyl] naphthalen-2-ol(L1H) and 4-bromo-2-{(E)-[(2-methyl-5-nitrophenyl) imino]methyl}phenol (L2H) have been synthesized and characterized. The resulting complexes were characterized by thermogravimetric analysis, magnetic moment measurements, conductivity measurements, IR, UV-visible spectral studies. The Schiff bases acts as bidentate monobasic ligands, coordinating through deprotonated phenolic oxygen and azomethine nitrogen atoms. The complexes are nonelectrolytic in DMSO. The presence of the two coordinated water molecules in these complexes was indicated by IR spectra and thermogravimetric analysis of the complexes. From the analytical and spectral data thestoichiometry of these complexes have been found to be[M(L1)(L2)(H2O)2] {where M = Co(II), Ni(II), Cu(II) and Zn(II)}. It is found that Co(II), Ni(II), Cu(II) and Zn(II) complexes exhibited octahedral geometry.

Keywords: Schiff bases, Mixed ligand, Metal complexes.