Investigation of tellurium Complexes Containing bidentate Schiff Base Derived from Vanillin and 4-Aminoantipyrine

Abstract

A novel bidentate Schiff base derived from vanillin and 4-aminoantipyrine, form 1:1 complexes with aryltellurium(IV) trichlorides and diaryltellurium(IV) dichlorides of the type VL-AAP.ArTeCl₃ and VL-AAP.Ar₂TeCl₂ (where Ar = p-methoxyphenyl, p-ethoxyphenyl, p-hydroxyphenyl and 3-methyl-4-hydroxyphenyl and VL-AAP = Schiff base). These complexes have been characterized by elemental analyses, molar conductance, IR and ¹H NMR spectroscopy. On the basis of these studies the donor sites have been identified as carbonyl oxygen of the pyrazolone ring and nitrogen atom of azomethine group (CH=N) to give five membered chelate ring with tellurium centre having Ψ-octahedral geometry. The synthesized ligand, and its aryltellurium complexes were screened for their antimicrobial activity against various bacterial and fungal strains.