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Hexafluoro complex of rutherfordium in mixed HF/HNO$$_{3}$$ solutions

Toyoshima, Atsushi; Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Akiyama, Kazuhiko*; Goto, Shinichi*; Ishii, Yasuo; Nishinaka, Ichiro; Sato, Tetsuya; Nagame, Yuichiro; Sato, Wataru*; Tani, Yuki*; Hasegawa, Hiroko*; Matsuo, Keiji*; Saika, Daisuke*; Kitamoto, Yusuke*; Shinohara, Atsushi*; Ito, Maya*; Saito, Junko*; Kudo, Hisaaki*; Yokoyama, Akihiko*; Sakama, Minoru*; Sueki, Keisuke*; Oura, Yasuji*; Nakahara, Hiromichi*; Sch$"a$del, M.*; Br$"u$chle, W.*; Kratz, J. V.*

Formation of an anionic fluoride-complex of element 104, rutherfordium (Rf) produced in the $$^{248}$$Cm($$^{18}$$O,5n)$$^{261}$$Rf reaction was studied by an anion-exchange method based on an atom-at-a-time scale. It was found that the hexafluoro complex of Rf, [RfF$$_{6}$$]$$^{2-}$$, was formed in the studied fluoride ion concentrations of 0.0005 - 0.013 M. Formation of [RfF$$_{6}$$]$$^{2-}$$ was significantly different from that of the homologues Zr and Hf, [ZrF$$_{6}$$]$$^{2-}$$ and [HfF$$_{6}$$]$$^{2-}$$; the evaluated formation constant of [RfF$$_{6}$$]$$^{2-}$$ is at least one-order of magnitude smaller than those of [ZrF$$_{6}$$]$$^{2-}$$ and [HfF$$_{6}$$]$$^{2-}$$.

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Category:Chemistry, Inorganic & Nuclear

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