Novel Ligands for the Separation of Trivalent Lanthanides and Actinides – Tetrakis(phosphane sulfide) and -(phosphinic acid) Cavitands
✍ Scribed by Harold Boerrigter; Tanja Tomasberger; Willem Verboom; David N. Reinhoudt
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 354 KB
- Volume
- 1999
- Category
- Article
- ISSN
- 1434-193X
No coin nor oath required. For personal study only.
✦ Synopsis
Cavitands with phosphane sulfide moieties 4 and 8a,b were sulfides 4 and 8a,b Am III and Eu III are not extracted, not even in the presence of synergents (e.g. TBP, TOPO, HDNNS). prepared in good yields from their phosphane oxide analogues, as more stable alternatives for the Cavitand 10 with phosphinic acid groups efficiently extracts Eu III in 1:1 or 2:1 complexes, depending on the metal-to-dithiophosphinic acids used at present. The cavitands 7a and 7b with flexible butoxyphosphane oxide ligating sites are ligand concentration ratio (extraction constants K ex 1 = 3.9•10 -5 M 2 and K ex 2 = 1.9•10 2 M, respectively). Furthermore, in the more efficient than cavitand 3 having rigid methylphosphane oxide groups as was studied with Eu III picrate extractions. case of 10 Eu III is preferentially extracted over Am III with a separation factor S Eu/Am up to 5. Due to the absence of an ionic functionality in the phosphane be desirable to develop more stable extractants with similar [a] Nuclear Research and Consultancy Group (NRG) phane sulfides (e.g. 471X [11] ) will be even weaker [formerly: