and Hg(I1) ions. I t i s concluded t h a t t h e ligands a r e bonded t o t h e metal ion through t h e a-nitrogen atom of t h e a r y l azo group and N-3 of t h e imidazole ring. The apparent formation cons t a n t s of t h e complexes i n solution have been determined.
The preparation of a series of new UO2(II) and Th(IV) complexes of some salicylideneamino acids is described. The complexes formed have been characterized by elemental analysis, extension of the spectrophotometric molar ratio and continuous variation methods to a three‐component complex system, IR‐spectra and conductance measurements. It is concluded that the salicylideneamino acid coordinates to the metal ion as a bivalent tridentate ligand. The bonding sites are the two oxygen atoms of the hydroxy and carboxyl groups belonging to the salicyl and amino acid moieties respectively and the central azomethine nitrogen. Furthermore, the apparent formation constants of the different complexes were determined spectrophotometrically and discussed.
Y(III), La(III), and Zr(IV) complexes with some heteroaromatic Schiff bases derived from salicylaldehyde and heteroaromatic amines, viz 2-amino-pyridine,
-a m i n o -4 -p h e n y l t h i a z o l e and -a m i n o -5 -p h e n y l -1 , 3 , 4 -t h i a d i a z o l ehave been prepared, The s t r u c t~r e s o f the complexes have been investigated b y elemental analysis, the spectrophotometric molar ratio and continuous variation methods as well as infrared spectra. It is found that the complexes obtained are characterized by high coordination number.
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