Abstract
Four new dioxouranium(VI) complexes, [UO
2
(acac-o-phdn)(L)] where L = H
2
O, py, DMF and Et
3
N, 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 H
2
O 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.