Fluoride complexation of rutherfordium (Rf, element 104)
- 1 May 2000
- journal article
- Published by Walter de Gruyter GmbH in Radiochimica Acta
- Vol. 88 (5), 265-272
- https://doi.org/10.1524/ract.2000.88.5.265
Abstract
The fluoride complexation of the group-4 elements Zr, Hf and Rf, and of the pseudo-homolog Th, has been investigated in mixed HNO3/HF solutions by studying Kd values on both cation exchange resins (CIX) and anion exchange resins (AIX) using the automated rapid chemistry apparatus ARCA. On the CIX, the four elements are strongly retained as cations below 10-3M HF. For Zr and Hf, the decrease of the Kd values due to the formation of fluoride complexes occurs between 10-3M HF and 10-2M HF. For Rf and Th, this decrease is observed at one order of magnitude higher HF concentrations. On the AIX, for Zr and Hf, a rise of the Kd values due to the formation of anionic fluoride complexes is observed between 10-3M HF and 10-2M HF, i.e. in the same range of HF concentrations where the decrease of the Kd values on the CIX is observed, yielding a consistent picture. For Rf and Th, on the AIX, no rise of the Kd values is observed even if the HF concentration is increased up to 1 M. By varying the concentration of the counter ion NO3-which is competing for the binding sites on the AIX resin, it could be shown, nevertheless, that Rf does form anionic fluoride complexes. Apparently, there is a more specific competition of NO3-with respect to [RfFx](x-4)-than with [ZrFy](y-4)-and [HfFz](z-4)-.Keywords
This publication has 9 references indexed in Scilit:
- Ion Exchange Equilibria and Stoichiometry of Complexes of Element 104 and Hafnium in Hydrofluoric Acid SolutionsRadiochimica Acta, 1998
- Chemical properties of element 106 (seaborgium)Nature, 1997
- First Aqueous Chemistry with Seaborgium (Element 106)Radiochimica Acta, 1997
- Chemical Studies of Rutherfordium (Element 104) : Part III. Solvent Extraction into Triisooctylamine from HF SolutionsRadiochimica Acta, 1996
- Ionization potentials and radii of atoms and ions of element 104 (unnilquadium) and of hafnium (2+) derived from multiconfiguration Dirac–Fock calculationsThe Journal of Chemical Physics, 1990
- Study of the Solution Chemistry of Element 104 – KurchatoviumRadiochimica Acta, 1990
- ARCA II – A New Apparatus for Fast, Repetitive HPLC SeparationsRadiochimica Acta, 1989
- Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenidesActa Crystallographica Section A, 1976
- Hard and Soft Acids and BasesJournal of the American Chemical Society, 1963