New bis(triazinyl) pyridines for selective extraction of americium(III)

Hudson, M.J., Boucher, C.E., Braekers, D., Desreux, J.F., Drew, M.G.B., Foreman, M.R.S., Harwood, L.M. ORCID: https://orcid.org/0000-0002-8442-7380, Hill, C., Madic, C., Marken, F. and Youngs, T.G.A. (2006) New bis(triazinyl) pyridines for selective extraction of americium(III). New Journal of Chemistry, 30 (8). pp. 1171-1183. ISSN 1144-0546 doi: 10.1039/b514108g

Abstract/Summary

New hydrophobic, tridentate nitrogen heterocyclic reagents (BATPs) such as 2,6-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydrobenzo[1,2,4]triazin-3-yl) pyridine (1) and 2,6-bis(9,9,10,10-tetramethyl-9,10-dihydro-1,2,4-triaza-anthrane-3-yl) pyridine (2) have been studied. I is resistant to hydrolysis in 3 M nitric acid, whereas 2 is resistant to both acid hydrolysis and radiolysis. The molecules are able to give significantly enhanced separations of americium(III) from an excess of europium(III) in nitric acid. Typically, for 1 D-Am = 500 and SFAm,/Eu = 5000 compared with D-Am = 30 and SFAm /Eu = 400 with the reference molecule 2,6-bis(isopropyl[1,2,4]triazin-3-yl) pyridine (7). In order to increase the stability of 1 and 2, the labile alpha-benzylic hydrogens that are present in 7 have been replaced by alkyl groups. Three molecules of 1 are able to enclose completely the coordination sphere of the M(III) in the crystal structure of [Y(1)(3)][Y(NO3)(5)]center dot NO3 center dot 2.5H(2)O.