A Fluorescence Emission, FT-IR and UV-VIS Absorption Study of the Some Uranium (VI) Schiff Bases Complexes

Abstract

The capacity of metallic ions to form complexes depends on the electric charge and its mass and on the ligands nature. In this study we followed the coordination capacity of the uranyl ion (UO2(2+)) with a series of Schiff bases. The Schiff bases have been obtained through the condensation of some salicylic aldehyde derivates with a series of diamines. As a result of the reaction between these substances and the uranyl ions the mono-, bi-, or poly-nuclear complexes, depend on the nature of the ligands. The forming of the complexes is highlighted through ultraviolet-visible, Fourier transform infrared (IR), and fluorescence spectroscopy. In the IR studies the forming of the complexes is highlighted by the apparition of a new band at approximately 920 cm(-1,) characteristic to the O=U=O group. Also modifications of valence vibrations appear characteristic to the azomethinic groups, nu(C=N,) and the apparition of some new bands in the 300-500 cm(-1) domain, characteristic to forming of some new bonds U-O and U-N. The formed complexes represent tetragonal bipyramidal geometry. The study of the capacity coordination of uranyl ions is important in determining, dozing and precipitin of the ions in diverse used waters.

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“…The C=N stretching vibrations of L 1 obtained at 1586 cm -1 was shifted to 1585 cm -1 when it was compared with L 1 Co(II) complex. Thus, it illustrate the binding from one of the azomethine nitrogen to cobalt (Măluţan and Pui 2008;Tătaru and Humelnicu 2008;Ngan and Lo 2011;Temel and İlhan 2008;Temel and İlhan 2006;Wang and Yang 2005). The change of Ar-O vibration in L 1 Co also proves the coordination of Co to aromatic oxygen (Sallomi and Shaheen 1994).…”

Electrical and photoelectrical behaviour of heterojunctions based on novel oligomeric metal complexes

“…As regards the FT‐IR data, ligand L 1 exhibits two CN peaks at 1599 and 1616 cm −1 . The weak peak at 3147 cm −1 and intense peak at 1519 cm −1 are assigned to NH and NNH, respectively .…”