Chelates of CE [III], Th [IV] and UO2 [VI] with some schiff bases

ABSTRACT

SCHIFF bases are well known to have pronounced biological activities. Their ready synthesis and active properties have contributed greatly to their popularity and to the study of many biological systems [1-3]. Metal complexes of Schiff bases are studied extensively due to synthetic flexibility of these compounds and their selectivity as well as sensitivity towards several metal ions. Several reviews have been devoted to coordination chemistry of Schiff base metal complexes [4-7] Dioxouranium [VI] complexes [12] of some salicylaldehyde Schiff bases have been synthesized [8] Anthranilic acid Schiff base complexes with Th [IV], UO[2] [VI], La [III], Ce [III] and Zr [IV] have been isolated and studied by several techniques [9] The coordination of Th [IV] and UO[2] [VI] with a number of mono and polydentate Schiff bases has been studied. Several bi-and trinuclear complexes have been investigated [10]. The present article deals with the evaluation of the ionization constants of Schiff bases [I], [II] and [III] and the stability constants of their complexes with Ce [III], Th [IV] and UO[2]>2 [VI] ions. The solid complexes which could be isolated were also investigated by elemental analysis and IR spectroscopy