Binding of stereognostically designed ligands to trivalent, pentavalent, and hexavalent f-block elements
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Sergey I. Sinkov
Abstract
Stability constants were determined for the complexes formed from two stereognostically designed ligands and the f-block elements Nd(III), Np(V), and Pu(VI). The ligands investigated were tris[3-(2-carboxyphenoxy)propyl]amine (NPB) and tris-N,N´,N´´-[2-(2-carboxy-4-ethyl-phenoxy)ethyl]-1,4,7-triazacyclononane (EETAC). A stereognostically blind ligand, nitrilotriacetic acid (NTA), was also investigated for comparison. The results suggest that there is no significant stereognostic effect for complexation of NPB or EETAC to Np(V). On the other hand, a modest stereognostic effect is seen for the NPB ligand when complexed to Pu(VI), leading to an approximately 8-fold increase in the binding strength. A more significant effect is observed for the EETAC system in which a 250-fold increase in binding is observed for Pu(VI) vs. Nd(III).
© by Oldenbourg Wissenschaftsverlag, Richland, WA 99352, Germany
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Articles in the same Issue
- Ratio primary reference measurement procedure (RPRMP) for the determination of iron in biological materials by RNAA
- Binding of stereognostically designed ligands to trivalent, pentavalent, and hexavalent f-block elements
- Uranyl complexes formed with a para-t-butylcalix[4]arene bearing phosphinoyl pendant arms on the lower rim. Solid and solution studies
- Spectroscopic studies on U(VI)-salicylate complex formation with multiple equilibria
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- Coprecipitation of europium with barium sulphate
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- Increase in the specific radioactivity of tritium-labeled compounds obtained by tritium thermal activation method
