Abstract

SYNTHESIS AND STRUCTURAL STUDIES OF A NEW POLYDENTATE LIGAND AND ITS NI (II) AND ZN (II) COMPLEXES

Dr. P. R. Logesh Kumar*, Dr. P. Vasanth Kumar, Shaik Shaheen and Dandu Ayesha

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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 ophenylenediamine. The Ni (II) and Zn (II) complexes of the ligand were synthesized and characterized on the basis of their spectral (IR, NMR, UV- Vis, 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.

Keywords: polydentate ligand, Ni (II) and Zn (II) complexes, HPAPAA.