Electrical Conductivity, Electronic Absorption, IR and NMR Studies On Cr(III), Sn(IV) and Pb(IV) Complexes of an Azo Ligand derived from Isatin and 4-Aminoantipyrine.

Abstract

The electrical conductivity, electronic absorption, IR and NMR spectroscopy of an azo ligand synthesized by coupling IH-indole-2,3-dione(isatin) with diazotized I-phenyl-2,3-dimethyl-4-aminopyrazole-5-one (4-aminoantipyrine) have been studied. The ligand: 6-[(E)-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-lH-pyrazole-4-yl)diazenyl]-lH-indole-2,3-dione(DPDD), forms stable complexes with metal ions, such as Cr(III), Sn(IV) and Pb(IV). These complexes have potential application in pharmacology. Their structures were investigated by UV and IR spectroscopy. Analytical data on the composition of the complexes show that Cr(IV) and Sn(IV) formed complexes with 2:l metal-ligand mole ratio, whereas complexation with Pb(IV) followed 2:1 metal-ligand stoichiometry.

Keywords: Azoligand; DPDD; metal complexes; 4-aminoantipyrine; isatin; Cr(III); Sn (IV); Pb(IV).