Aggregation and metal ion extraction properties of novel, silicon-substituted alkylenediphosphonic acids.
In conjunction with efforts to develop novel actinide extractants exhibiting solubility in supercritical carbon dioxide, the effect of adding silicon-based functionalities to diphosphonic acids has been investigated. Specifically, a series of silyl-substituted diphosphonic acids has been prepared and characterized, and their aggregation and metal ion extraction properties compared with alkyl-substituted diphosphonic acids, reagents previously demonstrated to be effective extractants of actinides from acidic aqueous media into various organic solvents. In addition, the influence of the number of methylene groups bridging the phosphorus atoms of the diphosphonic acids on their extraction behavior has been investigated. Variations in the extraction behavior of the compounds arising from differences in the number of bridging methylene groups have been shown to be attributable to a combination of factors, in particular, the aggregation state of the ligand, the size of the chelate rings formed upon complexation, the basicity of the phosphoryl group and the relative acidities of the ligands.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 797891
- Report Number(s):
- ANL/CHM/CP-103997; TRN: US0202962
- Resource Relation:
- Conference: 16th International Solvent Extraction Conference (ISEC 2002), Capetown (ZA), 03/18/2002--03/21/2002; Other Information: PBD: 10 May 2001
- Country of Publication:
- United States
- Language:
- English
Similar Records
Metal extraction by silyl-substituted diphosphonic acids. Part 2. Effect of alkyl bridge length on aggregation and metal ion extraction behavior.
Metal extraction by alkyl substituted diphosphonic acids. Part 4, P,P{sup1}-DI(2-ethylhexyl) butanediphosphonic acid.