Anionic fluoro complex of element 105, Db

Kasamatsu, Yoshitaka*; Toyoshima, Atsushi; Asai, Masato  ; Tsukada, Kazuaki  ; Li, Z.; Ishii, Yasuo; Tome, Hayato*; Sato, Tetsuya   ; Kikuchi, Takahiro; Nishinaka, Ichiro; Nagame, Yuichiro ; Haba, Hiromitsu*; Kikunaga, Hidetoshi*; Kudo, Yuki*; Oura, Yasuji*; Akiyama, Kazuhiko*; Sato, Wataru*; Oe, Kazuhiro*; Fujisawa, Hiroyuki*; Shinohara, Atsushi*; Goto, Shinichi*; Hasegawa, Taichi*; Kudo, Hisaaki*; Nanri, Tomohiro*; Araki, Mikio*; Kinoshita, Norikazu*; Yokoyama, Akihiko*; Fan, F.*; Qin, Z.*; Dllmann, C. E.*; Schdel, M.*; Kratz, J. V.*

We report on the characteristic anion-exchange behavior of the superheavy element dubnium (Db) with atomic number Z = 105 in HF/HNO solution at the fluoride ion concentration [F] = 0.003 M. The result clearly demonstrates that the fluoro complex formation of Db is significantly different from that of the group-5 homologue Ta in the 6th period of the periodic table while the behavior of Db is similar to that of the lighter homologue Nb in the 5th period.