Synthesis and Structural Studies of a New Polydentate Ligand and its Ni (II) and Zn (II) Complexes
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Date
2015-02-02
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Addis Ababa University
Abstract
A new polydentate ligand N-(2-hydroxyphenyl)-2-[(2-aminophenylamino)] acetamide,
(HPAPAA) has been synthesized in the reaction between N-(2-hydroxyphenyl)-2-
chloroacetamide and o-phenylenediamine. The Ni (II) and Zn (II) complexes of the
ligand were synthesized and characterized on the basis of their spectral (IR, NMR, UVVis,
and AAS), elemental analyses, conductivity and magnetic susceptibility
measurements. The Ni (II) and Zn (II) metal complexes were synthesized in methanolic
media. Metal-to-ligand ratios were found to be 1:1 for both complexes. Conductivity
measurements suggested that both complexes were non-electrolytes. Binuclear Ni (II)
complex exhibited subnormal magnetic moments indicating the possibility of
antiferromagnetic interaction through a possible super exchange mechanism. The ligand
behaves as dibasic tridentate, employing ONO donor sequence in chelation including
phenoxide bridging. Based on the analytical, infrared, conductivity, magnetic
susceptibility and electronic spectral data it may be concluded that octahedral geometry
for Ni (II) complex and, square planar geometry for Zn (II) complex was suggested.
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Keywords
Polydentate Ligand, Ni (II) and Zn (II) Complexes, HPAPAA