Infrared and Thermal Studies of Some Six-Coordinated Zirconium(IV) Complexes of Schiff Bases of 4-Aminoantipyrine†

Abstract

In the present investigation, we wish to report the synthesis of

some six-coordinated zirconium(IV) complexes of Schiff bases

derived from 4-aminoantipyrine with the general composition

[Zr(OH)₂L₂]Cl₂, where L = 4 [(N-benzalidene)amino]antipyrine,

4[(N-p-diaminobenzalidene)amino]antipyrine, 4[(N-2-hydroxybenzalidene)

amino]antipyrine, 4[(N-p-methoxybenzalidene )amino]

antipyrine, 4 [(N-4-hydroxy-3-methoxybenzalidene)amino]antipyrine,

4[(N-2-hydroxy-1-naphthalidene)amino]antipyrine,

4-[(N-cinnamalidene)amino]-antipyrine, 4[(N-(3,4,5-trimethoxyben

zalidene )amino)]-antipyrine and 4[(N-furfural)amino]antipyrine.

All the complexes were characterized by elemental analysis, conductance,

molecular weight and infrared. The IR data of the complexes

reveal the bidentate nature (O, N) of the ligand. The probable

coordination number of zirconium(IV) is found to be six in the

present complexes. Thermal data suggest the presence of coordinated

water molecule in the complexes.