Uranium and Plutonium Extraction by Organophosphorus Compounds

Abstract

Organic phosphates, phosphonates, phosphinates and phosphine oxides are compared as solvents for uranium and plutonium nitrates. Distribution coefficients for U(VI) and Pu(IV) and (VI) indicate a large difference in solvent strength among these groups of compounds. The introduction of an electronegative group greatly reduces the solvent strength. The P-0 stretching frequency can be correlated with solvent strength for these compounds. Some solid complexes of the organophosphorus compounds with uranyl nitrate have been isolated.

Synthesis and spectroscopic study of mesoporous aluminum methylphosphonate foam templated by dibutyl methylphosphonate

“…Compared with free DBMP [45], the frequency of P@O in DMM shifts from 1241 to 1196 cm À1 . In DMM, the electron-rich phosphoryl oxygen of DBMP could interact with the hydroxyl group of MPA through the hydrogen bond to give this effect.…”

Organophosphorus–uranyl Complexes Studied by Nuclear Magnetic Resonance Spectroscopy

“…linear correlation with extracting ability for these compounds (19). Thus a decrease in the stretching frequency is observed as extracting ability increases, i.e.…”

“…Phosphine oxide, which forms the strongest complex, presumably has the inost negative oxygen of the compounds studied (16,18,19). As a second order effect, complexation results in phosphorus chemical shifts downfield from those of the free ligand.…”

Template-assisted syntheses of two novel porous zirconium methylphosphonates

“…The band at 1281 cm À1 is assigned to m P@O and the bands at 916, 807, 769, and 445 cm À1 are attributed to P-O bonds in DBMP. Comparing with free DBMP, the m P@O band in ZMP shifts towards higher wavenumber [40]. The phenomenon indicates that the bound DBMP is located in an electron-negative environment.…”