Preparation of t-Alkylphosphonic Dichlorides¹

Complexes of diethyl‐2‐amino‐2‐oxoethylphosphonate with lanthanide nitrates

“…The group of carbamoylmethylphosphonates (2-amino-2-oxoethylphosphonates and derivatives) appears to be closely related to ␤-diketones. They provide a system in which a variety of metal-ligand bonding may be studied [1][2][3][4][5]. These mixed ligands containing P O, and N C O donor groups are widely used for extraction and separation of ions [6-8] related to nuclear fuels processing.…”

“…These mixed ligands containing P O, and N C O donor groups are widely used for extraction and separation of ions [6-8] related to nuclear fuels processing. The type of coordination and the coordination numbers depend strongly on the metal salts, as well as on the substituents of the phosphorus and amide nitrogen atoms [1][2][3][4][5]. In our previous work we described the synthesis and structures of complexes of lanthanide elements with 2-oxo-phosphonates and phosphine oxides [9] as well as of 2-dimethylamino-2-oxoethylphosphonates [10].…”

Alkylation and pre-organisation of diglycolamide ligands on flexible platforms for nuclear waste treatment

“…85,86 The presence of the carbonyl group reduced the competition between HNO3 and the desired metal ion for the phosphoryl group, thus improving the extraction of Am(III) and Ln(III). However, CMPs are susceptible to radiolytic and hydrolytic degradation, have a tendency for third phase formation, show a low efficiency during the stripping of Pu and U and result in an increased volume of waste due to the need of salting out agents.…”

“…Pu was done by alpha-liquid scintillation counting using the Ultima Gold scintillator cocktail, while that of 85,89 Sr, 137 Cs and 241 Am was performed by gamma ray counting using a NaI(Tl) scintillation counter. Alpha-spectrometry was carried out using a silicon surface barrier detector.…”

“…Subsequently, the tubes were centrifuged and equal volumes of organic and aqueous phases (0.1 mL) were removed for assaying radiometrically. While 241 Am, 152,154 Eu, 137 Cs and 85,89 Sr were assayed using a well type NaI(Tl) scintillation counter interphased with a multichannel analyzer, 233 U and Pu were assayed radiometrically by using a liquid scintillation counting system (Hidex, Finland) using an Ultima Gold (Perkin Elmer) scintillation cocktail. The concentrations of the actinide and fission product elements Fig.…”