Abstract

D. Kumar¹, Amit Kumar², Vandana Pandey³ and A. Syamal⁴

A methanolic solution of Schiff base, LH2 (obtained by the condensation of 3-formylsalicyclic acid and 4-amino-3-methyl-5-thiohydroxy-1,2,4-triazole) reacts with hexadecaaquaoctahydroxo-tetrazirconium (IV) acetate to form seven coordinate zirconium(IV) complex, [Zr(OH)2 L 2CH3OH). The later reacts in THF with ON donor bidentate lignads (AA) [where AA= ethanolamine (ea), o-amimophenol (oap), o-aminobenzyl alcohol (oaba), o-hydroxybenzylamine (ohyba) or with NN donor bidentate ligands (BB) [here BB= ethyledediamine (en), trimethylenediamine (tn), o- phenylenediamnine (ophen), 2,2’-dipyridyl (dipy), 1,10-phenanthroline (phen)] to form seven coordinate zirconium (IV) heterochelates, [Zr(OH)2L(AA)] or [Zr(OH2L(BB)] respectively. [Zr(OH)2L-2CH3OH],[Zr(OH2)L(AA)] and [Zr(OH)2L(BB)] have been characterized by elemental analysis, molecular weight, molar conductance, IR and magnetic susceptibility measurements. IR data are indicative of the dibasic tridentate ONS donor nature of LH2. [Zr(OH)2L-2CH3OH],[Zr(OH2)L(AA)] and [Zr(OH)2L(BB)] are monomers, non-electrolytes, diamagnetic and possess a pentagonal bipyramidal structure.

Bidentate ligands; dibasic tridentate Schiff base; triazole; heterochelates

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