An Investigation of Ester Group Steric Effects on Metal Ion Extraction by Symmetrically Substituted Methylenediphosphonic Acids
| Autor: | Dominique C. Stepinski, P. R. Zalupski, Renato Chiarizia, Albert W. Herlinger, Daniel R. McAlister |
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| Rok vydání: | 2004 |
| Předmět: |
Steric effects
General Chemical Engineering Extraction (chemistry) chemistry.chemical_element Americium General Chemistry Actinide Calcium Medicinal chemistry Metal chemistry.chemical_compound chemistry Nitric acid visual_art visual_art.visual_art_medium Organic chemistry lipids (amino acids peptides and proteins) Derivative (chemistry) |
| Zdroj: | Solvent Extraction and Ion Exchange. 22:89-103 |
| ISSN: | 1532-2262 0736-6299 |
| DOI: | 10.1081/sei-120028004 |
| Popis: | Symmetrically substituted partial alkyl‐esters of methylenediphosphonic acid are powerful metal ion extractants for actinides in all oxidation states. A preliminary study of calcium and americium(III) extraction by the n‐octyl and 2‐ethylhexyl di‐substituted esters of methylenediphosphonic acid revealed the distribution ratios and the nitric acid dependency behaviors for the two extractants to be very similar, with the extraction efficiency for the n‐octyl ester somewhat higher than for the 2‐ethylhexyl derivative. Since the basicity of the phosphoryl groups in the two extractants should be essentially the same, the differences in the solvent extraction efficiency of these two C8‐alkyl‐substituted ligands could arise from differences in the steric requirements of the ester groups. Ester group steric effects on metal ion extraction for a series of symmetrically alkyl‐substituted partial esters and identically substituted tetra‐esters of methylenediphosphonic acid were investigated to gain insight ... |
| Databáze: | OpenAIRE |
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