IR and PMR studies of some uranyl-#betta#-diketone oxodonor adducts

Multiplets observed in the PMR spectra of the sulphoxide complexes have been ascribed to the presence of non-equivalent α-methylene protons caused by the dissymmetry of the S atom. Similar multiplets observed in TBP and DBBP complexes have been attributed to the spin coupling effect of 31P (S=1/2) nuclide. Coordinating ability of DBBP was found to be somewhat larger than that of TBP on the basis of complexation shifts in the multiplet centres of α-methylene protons in their respective complexes. PMR spectra of TTA protons in the synergistic complexes of sulphoxides and TBPO suggest the existence of these complexes as a mixture of cis-trans isomers. (author)