31P NMR spectroscopy is uniquely suited as an analytical tool because it is highly informative about the structure and molecular environment surrounding the phosphorus atom. Numerous molecules utilized across a broad range of disciplines rely upon ligands containing a complexing phosphorus functional group. In particular, nuclear extraction technologies use phosphorus containing ligands to complex actinide and lanthanide metal ions in complex mixed media solvent environments. Despite the potential usefulness of 31P NMR for studying these systems little is known about the effect of solvent on the chemical shift of ligands containing phosphorus as most studies are situational with respect to both ligand and solvent composition. In order to quantify these effects, we have investigated the influence of solvent polarity on the 31P NMR chemical shift of four phosphorus ligands used in nuclear fuel separation processes. The 31P NMR signals were correlated with empirical solvent parameters to assess solvent-ligand interactions that provide a simple and rapid method for quantifying both solvent electronic and steric effects on metal ligand complexes in applied solvent systems relevant to nuclear extraction technologies.

Detailed investigations of solvent effects for ligands containing phosphorus functional groups employing 31P NMR

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