Novel complexes of zirconium(IV) and uranium(II) with selective azodyes containing nitrogen and oxygen donor ligands have been prepared and characterized by elemental analysis, 1 H NMR and electronic spectral techniques. The important bands in the IR spectra and main 1 H NMR signals are assigned and discussed in relation to the proposed molecular structure of the complexes. The IR data of the azodye ligands suggested a bidentate binding involving azodye nitrogen and C-O/OH oxygen atom of enolic

more »

... group. They also showed the presence of Cl/OAc coordinating with the metal ion. The prepared complexes of Zr(IV) fall into four types. In the stoichiometric formulae of (1:1), the chelate rings are six-membered/five coordinate; whereas in the (1:2) they are six-membered/six coordinate and all of the complexes possess non-electrolytic properties. The UO 2 (II) complex, in the mean time, possesses a planar hexagonal structure with nitrogen and oxygen atoms in the axial position. The stretching vibrations and force constant interactions of the uranyl complexes have been determined and from which the U-O bond distances are calculated. These bond distances as well as the effect of Hamett's constant are also, in turn, calculated and discussed. ª 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University. *