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2011, Vol.84, No.9

903-911
Selected Paper

Fluorido Complex Formation of Element 104, Rutherfordium (Rf)

Ishii Yasuo 1 , 2 , Toyoshima Atsushi 1 , Tsukada Kazuaki 1 , Asai Masato 1 , Li Zijie 1 , Nagame Yuichiro 1 , Miyashita Sunao 2 , Mori Tomotaka 2 , Suganuma Hideo 2 , Haba Hiromitsu 3 , Goto Shin-ichi 4 , Kudo Hisaaki 4 , Akiyama Kazuhiko 5 , Oura Yasuji 5 , Shinohara Atsushi 6 , Schädel Matthias 1 , 7 , Pershina Valeria 7 , Kratz Jens V. 8 ... Show all
1 Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)
2 Radiochemical Research Laboratory, Shizuoka University
3 Nishina Center for Accelerator-Based Science, RIKEN
4 Department of Chemistry, Niigata University
5 Graduate School of Science and Engineering, Tokyo Metropolitan University
6 Graduate School of Science, Osaka University
7 GSI Helmholtzzentrum für Schwerionenforschung GmbH
8 Institut für Kernchemie, Universität Mainz
https://doi.org/10.1246/bcsj.20110126

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Abstract
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We have investigated the cation-exchange behavior of element 104, rutherfordium (Rf), together with its lighter group-4 homologs Zr and Hf, and the tetravalent pseudo-homolog Th in HF/HNO3 mixed solution. The results, obtained on a one-atom-at-a-time scale, demonstrate that distribution coefficients (Kd) of Rf in HF/0.10 M HNO3 decrease with increasing concentration of the fluoride ion [F−]. This resembles the behavior of the homologs, indicating the consecutive formation of fluorido complexes of Rf. We also measured the Kd values of Rf and the homologs as a function of the hydrogen ion concentration [H+] in the range of [F−] = 5.29 × 10−7–3.17 × 10−6 M. The log Kd values decrease linearly with an increase of log[H+] with slopes between −2.1 and −2.5. This indicates that these elements are likely to form the same chemical compounds: mixture of [MF]3+ and [MF2]2+ (M = Rf, Zr, Hf, and Th) in the studied solution. It is also ascertained that the fluorido complex formation of Rf is significantly weaker than that of Zr and Hf, but it is stronger than that of Th.

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