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

Michael J. HudsonSchool of Chemistry, University of Reading, Box 224, Whiteknights, Reading, Berkshire, UKCarole BoucherSchool of Chemistry, University of Reading, Box 224, Whiteknights, Reading, Berkshire, UKDamien BraekersUniversity of Liège, Coordination and Radiochemistry, Sart Tilman B16, Liège, BelgiumJean F. DesreuxUniversity of Liège, Coordination and Radiochemistry, Sart Tilman B16, Liège, BelgiumMichael G. B. DrewSchool of Chemistry, University of Reading, Box 224, Whiteknights, Reading, Berkshire, UKM.R.St.J. ForemanSchool of Chemistry, University of Reading, Box 224, Whiteknights, Reading, Berkshire, UKLaurence M. HarwoodSchool of Chemistry, University of Reading, Box 224, Whiteknights, Reading, Berkshire, UKCl ment HillC. MadicFrank MarkenDepartment of Chemistry, University of Bath, Bath, UKTristan G. A. YoungsSchool of Chemistry, University of Reading, Box 224, Whiteknights, Reading, Berkshire, UK

2006en

ABI

Annotatsiya

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. 1 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 1DAm = 500 and SFAm/Eu = 5000 compared with DAm = 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 In order to increase the stability of 1 and 2, the labile α-benzylic hydrogens that are present in 7 have been replaced by alkyl groups.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]·NO3·2.5H2O.

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DOI: 10.1039/b514108g

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