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

M J Hudson, C E Boucher, D Braekers, J F Desreux, M G B Drew, M R S Foreman, L M Harwood, C Hill, C Madic, F Marken, T G A Youngs

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Abstract

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 In order to increase the stability of 1 and 2, the labile alpha-benzylic hydrogens that are present in 7 have been replaced by alkyl groups.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.
Original languageEnglish
Pages (from-to)1171-1183
Number of pages13
JournalNew Journal of Chemistry
Volume30
Issue number8
DOIs
Publication statusPublished - 2006

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