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Synthesis And Structural Studies Of Transition Metal Complexes Derived From A Physiologically Active Monobasic Tridentate Ligand

V.Ramakrishna Rao, P.Venkateswar Rao, A.V.Chandrapal

A new physiologically active tridentate ligand,2[1(2-hydroxy-1-naphthyl) methylideneamino]benzamide-H2HNMAB has been synthesized. Oxovanadium(IV),Cr(III),Mn(II),Fe(III),Co(II),Ni(II),Cu(II)and Zn(II) complexes of the ligand have been prepared. The ligand is characterized by elemental analyses, infrared, UV, 1H NMR and Mass spectral data and the metal chelates are characterized by elemental analyses,conductivity data, magnetic susceptibility measurements,infrared, 1H NMR, UV-Vis- Near IR, ESR,AAS spectral data and TGA data. On the basis of the above data it is inferred that the ligand behaves as a monobasic tridentate ONO donor coordinating through the deprotonated phenolic oxygen ,oxygen of the amide carbonyl and nitrogen of the azomethine group. Oxovanadium(IV) complex is assigned a sulfate bridged dimeric square pyramidal geometry. Cr(III), Fe(III), Mn(II) and Co(II) complexes are proposed an octahedral geometry .Cu(II) and Ni(II) complexes are proposed with a square planar disposition. Zn(II) complex is proposed to a tetrahedral geometry.The ligand and the metal chelates were screened for their anti microbial activity against S.aureus and E.Coli, which are the gram +ve and gram –ve bacteria.