Synthesis, spectroscopy, and thermal study of uranyl unsymmetrical Schiff base complexes

The new uranyl complexes with tetradentate unsymmetrical N2O2 Schiff base ligands were synthesized and characterized by IR, UV–vis, NMR and elemental analysis. The DMF solvent is coordinated to uranyl complexes. The thermogravimetry (TG) and differential thermoanalysis (DTA) of the uranyl complexes were carried out in the range of 20–700 °C. The UO2L1 complex was decomposed in two and the others were decomposed in three stages. Up to 100 °C, the coordinated solvent was released then the Schiff base ligands were decomposed in one or two steps. Decomposition of synthesized complexes is related to the Schiff base characteristics. The thermal decomposition reaction is first order for the studied complexes.

Some new uranyl complexes with tetradentate unsymmetrical N2O2 Schiff base ligands were synthesized and characterized by IR, UV–vis, NMR and elemental analysis. The thermogravimetry (TG) and differential thermoanalysis (DTA) of the uranyl complexes were carried out in the range of 20–700 °C.Figure optionsDownload as PowerPoint slideHighlights
► Synthesis of uranyl Schiff base complexes in DMF.
► Coordinated DMF solvent to the uranyl center.
► Spectroscopic of Uranyl complexes.
► The thermal gravimetric of uranyl Schiff base complexes.
► First order kinetics of decomposition pathways.