35171-28-9Relevant academic research and scientific papers
Bis-(1,2,4-triazin-3-yl) ligand structure driven selectivity reversal between Am3+and Cm3+: solvent extraction and DFT studies
Ansari, S. A.,Bhattacharyya, Arunasis,Karthikeyan, N. S.,Mohapatra, P. K.,Rao, T. S.,Ravichandran, C.,Seshadri, H.,Venkatachalapathy, B.
, p. 7783 - 7790 (2021/06/16)
Selectivity between Am3+and Cm3+was investigated after their aqueous complexation with three structurally tailored hydrophilic bis-(1,2,4-triazin-3-yl) ligands followed by their extraction withN,N,N′N′-tetraoctyl diglycolamide (TODGA) dissolved in an ionic liquid (C4mim·Tf2N). The three hydrophilic ligands used were SO3PhBTP, SO3PhBTBP, and SO3PhBTPhen. It was evident from the solvent extraction studies that SO3PhBTP formed a stronger complex with Cm3+than with Am3+, but SO3PhBTPhen showed better complexation ability for Am3+than for Cm3+, and SO3PhBTBP showed no selectivity for the two actinide ions. DFT calculations indicated that the coordinating ‘N’atoms in BTP were more co-planar in the complex and this co-planarity was higher in the Cm3+complex as compared to that in Am3+. In the case of BTBP and BTPhen ligands, on the other hand, the co-planarity was more pronounced in the Am3+complexes. Mayer's bond order calculations of M-N bonds in the complexes also indicated a reversal of the complexation ability of the BTP and BTPhen ligands for Am3+and Cm3+. Calculations of the complexation energies further supported the higher selectivity of the BTP ligand for Am3+by ?52.0 kJ mol?1, and better selectivity of the BTPhen ligand for Cm3+by ?24.7 kJ mol?1
Efficient Preparation of Pyridinyl-1,2,4-Triazines via Telescoped Condensation with Diversely Functionalized 1,2-Dicarbonyls
Tai, Serene,Marchi, Sydney V.,Carrick, Jesse D.
, p. 1138 - 1146 (2016/07/29)
The development of materials for efficient chemoselective extraction of minor actinides remains at the forefront of research efforts in the area of separation science. Lewis basic complexants derived from nitrogen-donor scaffolds are often employed in this area due to favorable complexation with the transuranic element americium. In the present work an efficient procedure for the preparation of eight useful 3-pyridin-2-yl-1,2,4-triazines (2 novel) is demonstrated via telescoped condensation with the requisite 1,2-dicarbonyl in two-pots without additives, differentially extractive work-up procedures, or recrystallization. Additional efforts in this area have demonstrated the utility of polar aprotic solvents for the preparation of nine functionalized pyridinyl-2,6-bis-1,2,4-triazines (4 novel) directly from the requisite 2,6-pyridine dicarbonitrile in 49–99% yield over four total steps. The streamlined preparation of these important materials and detailed synthetic procedures is reported herein.
