Investigations of Uranyl Fluoride Sesquihydrate (UOF·1.57HO): Combining F Solid-State MAS NMR Spectroscopy and GIPAW Chemical Shift Calculations.

High-resolution F magic-angle spinning (MAS) NMR spectra were obtained for the uranium-bearing solid uranyl fluoride sesquihydrate (UOF·1.57HO). While there are seven distinct crystallographic fluorine sites, the F NMR spectrum reveals six peaks at -33.

Coordination chemistry with f-element complexes for an improved understanding of factors that contribute to extraction selectivity.

Here, we highlight some recent accomplishments in f-element coordination chemistry aimed at probing the fundamental chemical differences between the 4f elements, lanthanides, and the 5f elements, actinides. The studies of particular interest are those that target improving our knowledge of fundamental chemistry to aid in increased selectivity for extractions of actinides. Two components key to understanding the challenges of actinide separations are detailed here, namely, previously described separation methods and recent investigations into the fundamental coordination chemistry of actinides.