Issue 26, 2025

Combination of chlorinated cobalt dicarbollide with N,O-donor ligands in extraction systems for separating f-elements

Abstract

Extraction systems for the separation of f-elements are an active area of research and continue to evolve. Modifications are being made to both solvents and extractant structures; however, the variety of available solvents and synthetically accessible ligands remains limited. In this context, the use of synergistic additives presents a promising strategy for enhancing the extraction performance of existing systems. In the present study, we investigated modifications to extraction systems aimed at f-element separation, with a particular focus on diamides of 1,10-phenanthroline-2,9-dicarboxylic acid and 2,2′-dipyridyl-6,6′-dicarboxylic acid in combination with chlorinated cobalt dicarbollide (CCD) in the polar fluorinated organic diluent m-nitrobenzotrifluoride (F-3). The advantages and limitations of the resulting extraction systems were assessed. Special attention was given to changes in complexation mechanisms and to the speciation of actinides and lanthanides within these systems, as studied by UV–vis titration, X-ray diffraction (XRD), radiometric analysis, Raman spectroscopy, and 11B-NMR spectroscopy.

Graphical abstract: Combination of chlorinated cobalt dicarbollide with N,O-donor ligands in extraction systems for separating f-elements

Supplementary files

Article information

Article type
Paper
Submitted
14 May 2025
Accepted
02 Jun 2025
First published
03 Jun 2025

Dalton Trans., 2025,54, 10327-10342

Combination of chlorinated cobalt dicarbollide with N,O-donor ligands in extraction systems for separating f-elements

M. A. Gerasimov, M. I. Koifman, L. O. Lanin, V. R. Prizhilevskaya, P. Kalle, N. R. Yarenkov, V. A. Zhuravleva, E. A. Konopkina, A. V. Gopin, M. V. Evsiunina, N. E. Borisova and P. I. Matveev, Dalton Trans., 2025, 54, 10327 DOI: 10.1039/D5DT01136A

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