A comparative evaluation of the liquid–liquid extraction and pertraction efficiency of a both-side diglycolamide-functionalized calix[4]arene with analogous upper and lower-rim calixarenes for actinide separations

Diglycolamide-functionalized poly(propylene imine) diaminobutane dendrimers for sequestration of trivalent f-elements: synthesis, extraction and complexation

“…The log β value of the ML species (M = Eu 3+ and L = ligand) 9 for the two ligands follows the order: 7.35 (one side) > 6.71 (both sides). The D value of Am 3+ by the two ligands, measured under identical conditions, 19 follows the order: 48.5 (both sides) ≫ 1.9 (one side). Though the β value for the both side C4DGA ligand is an order of magnitude lower than that of the one site C4DGA ligand, the D value for Am 3+ is several folds higher.…”

Diglycolamide-Functionalized Calix[4]arene for Am(III) Recovery from Radioactive Wastes: Liquid Membrane Studies Using a Hollow Fiber Contactor

“…Attempts to understand this anomalous selectivities of DGA ligands with f -elements revealed that these ligands form reverse micelles in paraffinic solvents, such as n -dodecane, which apparently facilitate Am­(III) extraction to a much greater extent than that of Pu­(IV) and U­(VI). − In view of the reverse micelle formation tendencies of the DGA ligands, attempts were made to synthesize multiple-DGA-functionalized ligands, where DGA moieties are appended to a pivot atom to form a tripodal platform − or to a calix[4]­arene or a pillar[5]­arene skeleton to mimic the aggregate structure of DGA. During the last couple of years, DGA-functionalized calix[4]­arene (C4DGA) ligands have been extensively studied for their complexation and separation behavior toward trivalent actinides from acidic feed solutions. − Solvent extraction studies indicated that these C4DGA ligands show several orders of magnitude higher extraction of Am­(III) than the bare DGA ligands such TODGA . The results of solvent extraction studies with these ligands are very promising and encourage their use in supported liquid membranes, with significantly lower ligand inventory.…”

Polymer inclusion membrane containing a diglycolamide-functionalized calix[4]arene for actinide ion uptake and transport

“…This aggregate formation highly depends on the diluent properties and hence the extraction behavior of the actinides changes drastically with diluents polarity. In order to mimic the effectiveness of the TODGA-based aggregation independent of diluent polarity, derivatives of diglycolamides were synthesized where four diglycolamide (DGA) units, each containing two n-octyl groups at the outer amide group, were appended at the lower rim of the calix [4]arene skeleton [12][13][14]. The four preorganized DGA groups enhance the complexation ability of the ligand by a co-operative complexation mechanism resulting from entropy stabilization [15].…”