COMPLEXING BEHAVIOR OF ETHYLENEDIAMINE BIS(ISATIN) SCHIFF-BASE LIGANDTOWARDS SOME METAL-IONS

The synthesis and identification of a new series of the metal chelates of MoO2(VI), UO2(VI), VO(IV), Pd(II), Ag(I), La(III), Ce(III) and Th( IV) with the ethylenediamine bis(isatin) Schiff base ligand are report ed. Elemental analysis, molar conductivity magnetic moment, spectral U V/Visible, IR and H-1 NMR data have been used to characterize these ch elates. It has been found that the ligand behaves as a dibasic ONNO qu adridentate ligand forming 1:1 (metal:ligand) stoichiomet;y. A non-ele ctrolytic nature is suggested for these chelates with exception of Ag( I), Th(IV) La(III) and Ce(III) chelates which exhibit a weak electroly tic behaviour. Different geometrical structures have been proposed for these chelates on the basis of magnetic and spectral measurements.