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.
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