In this work we report on new examples of phenanthrolindiamides containing asymmetric centers in amide substituents. The synthesized ligands are expected to have complex thermodynamic behavior. Their structure was unambiguously...
Reprocessing
of spent nuclear fuel (SNF) is an important task in
a frame of ecology and rational use of natural resources. Uranium,
as the main component of SNF (>95%), can be recovered for further
use as fresh nuclear fuel. To minimize an amount of solid radioactive
waste generated during SNF reprocessing, new extractants are under
investigation. Diamides of 1,10-phenanthroline-2,9-dicarboxylic acid
are perspective tetradentate N-donor ligands that form strong complexes
with f-elements, which are soluble in polar organic
solvents. As an example of three ligands of this class, we conducted
a comparative study and showed how the substituent in the amide functional
group affects the extraction ability toward uranyl nitrate from nitric
acid media. We have performed a careful study (NMR, FT-IR, XRD, RMC-EXAFS)
of the structures of synthesized complexes of new ligands with uranyl
nitrate and used quantum mechanical calculations to explain the discovered
regularities through.
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