Separation of Americium from Europium using Camphor-BisTriazinyl Pyridine: A Fundamental Study

Recent Progress in Trivalent Actinide and Lanthanide Solvent Extraction and Coordination Chemistry with Triazinylpyridine N Donor Ligands

“…68-69 2,6-bis(5,6,7,8-tetrahydro-5,9,9trimethyl-5,8-methano-1,2,4-benzotriazin-3-yl)pyridine (CA-BTP, Figure 3 top left) 70 was further studied, extending to further diluents. 71 CA-BTP however is not further studied in Europe due to problems with scale-up of the synthesis, i. e. the production of larger batches with reproducible properties.…”

Prediction of An(III)/Ln(III) Separation by 1,2,4-Triazinylpyridine Derivatives

“…Lanthanides produced concomitantly during the fission process act as poisons in modern nuclear reactors. 1 The primary hurdle in the extraction of actinides from lanthanides is the similarity in chemistry available to elements across these two f-blocks. Whereas extraction of lanthanides from each other is known and widespread in industry, understanding of the separation of actinides and lanthanides sharing the same f-shell configuration is still being developed.…”

“…2 A breakthrough in 1999 by Kolarik et al in the extraction of Am from Eu using 2,6-bis(5,6-dialkyl-1,2,4triazinyl-3-yl)pyridine (BTP, Figure 1a) led to the discovery that weakly basic soft nitrogen (and sulfur) donors have a much stronger ability to differentiate between actinides (Ans) and lanthanides (Lns) than do oxygen donors. 1,2,5,6 Nitrogen donors are preferred over sulfur, because the structures can be completely incinerated to environmentally benign gas phase products post complexation, whereas extant S donor extractants can leave a solid residue, making the products of the incineration harder and more difficult to store and, ultimately, to recover. 1,2 There are a large number of computational and experimental studies on bis-1,2,4-triazinylpyridines (BTP, Figure 1a), 7,8 BTP-like compounds such as bis(1,2,4-triazinyl)bipyridines (BTBP, Figure 1b), 9 as well as bis(1,2,4-triazinyl)-1,10phenanthrolines, 10 and their derivatives.…”

“…1,2,5,6 Nitrogen donors are preferred over sulfur, because the structures can be completely incinerated to environmentally benign gas phase products post complexation, whereas extant S donor extractants can leave a solid residue, making the products of the incineration harder and more difficult to store and, ultimately, to recover. 1,2 There are a large number of computational and experimental studies on bis-1,2,4-triazinylpyridines (BTP, Figure 1a), 7,8 BTP-like compounds such as bis(1,2,4-triazinyl)bipyridines (BTBP, Figure 1b), 9 as well as bis(1,2,4-triazinyl)-1,10phenanthrolines, 10 and their derivatives. 11−42 Computational studies of related ligands containing C, H, O, and N have also been reported, 43−46 although experimental data are largely lacking for these systems.…”

Synthesis of Functionalized Hemi‐1,2,4‐triazinyl‐[2,2′]‐bipyridines via Telescoped Condensation of [2,2′]‐bipyridinyl‐6‐carbonitrile

“…Transmutation and recovery of radionuclides intrinsic to used nuclear fuel continues to inspire significant effort. The fundamental impetus for our interest in this area is grounded in the hypothesis that moderately soft Lewis basic complexants with the appropriate physical properties can achieve selective separation of An(III) over Ln(III) from used nuclear fuel on a kinetically viable time scale with suitable distribution values . While previously prepared complexants successfully address some important challenges, work over the last three decades has yet to identify the ideal complexant .…”