Preparation, thermal and vibrational studies of [UO2(acac-o-phdn)(L)] (L=H2O, py, DMF and Et3N)

Four new dioxouranium(VI) complexes, [UO2(acac-o-phdn)(L)] where L = H2O, py, DMF and Et3N, with the tetradentate dibasic Schiff base (acac-o-phdn), derived from condensation of acetylacetone with o-phenylene diamine have been synthesized. The infrared spectra were obtained and full assignments of all the observed vibrations are proposed on the basis of C-2v symmetry for H2O and py complexes and C-s for the other two complexes, respectively. The bond stretching force constant and bond length of the U = O bond for the four complexes were calculated. Differential thermal analysis (DTA) and thermogravimetric (TG) analysis of the complexes were also carried out.