The impact of alicyclic substituents on the extraction ability of new family of 1,10-phenanthroline-2,9-diamides

Abstract

<p>Some unexpected “structure–extraction properties” patterns were found for new family of 1,10-phenanthroline-2,9-diamide derived ligands.</p>

First Trifluoromethylated Phenanthrolinediamides: Synthesis, Structure, Stereodynamics and Complexation with Ln(III)

“…Such complex 19 F and 13 C-NMR spectra indicate that the internal rotation along Phen-CO bonds in diamides 1 and 2 in solutions at 23 °C occurs as a fast process in the NMR time scale, while the rotation along the amide bonds N–C=O is completely inhibited. Thus, diamides 1 and 2 in this respect behave similarly to other ligands of this type that we studied earlier [ 23 ]. As a result, three rotamers along the amide bonds ( A – C ) ( Figure 3 ), differing in the orientation of -CHCF 3 fragments relative to the phenanthroline backbone, which coexist in solutions, give separate signals in the NMR spectra.…”

“…Continuing our studies of phenanthroline diamides [ 18 , 19 , 20 , 21 , 22 , 23 , 24 ], in this work, we have carried out a synthesis of 2-trifluoromethylpyrrolidine derived diamides 1 and 2 . Both compounds were prepared by acylation of 2-CF 3 -pyrrolidine by phenanthroline derived acyl chlorides.…”

Preorganization of N,O-hybrid phosphine oxide chelators for effective extraction of trivalent Am/Eu ions – a computational study

“…1 This has developed as a competent approach in dealing with the energy and climatechange crises. 2 Nevertheless, one of the major flaws of nuclear power plants is the requirement of discarding the spent nuclear fuel (SNF). 3,4 Although the vast majority of the U and Pu in SNF can be reused through the PUREX (plutonium uranium reduction extraction) process, 5,6 the most hazardous nuclides, that is, the seemingly perpetual and exceptionally radioactive minor actinides (MAs), 7,8 like Am(III) and Cm(III), contain PUREX raffinate.…”

“…12,13 Nevertheless, based on the hard-soft acid-base hypothesis, trivalent actinide ions are somewhat softer than lanthanide ions and form more stable covalent complexes with softer N-or S-donor ligands. 2,14 Therefore, exceptionally proficient partitioning of trivalent actinides over lanthanides can be accomplished utilizing these N-or S-donor ligands. Compared with the S-containing ligands, those N-and/or O-donor ligands that contain C, H, O, and N components (the CHON principle) 15,16 are decomposable and could deliver substantially less radioactive waste during the extraction cycle, and consequently they are more ideal extractants for the partitioning of trivalent actinides over lanthanides.…”

“…The substitution of phenyl and pyrrole groups has been shown in the literature to enhance the extraction and complexation ability of organic ligands. 2,38 Therefore, we considered these two substituents for this work.…”