Synthesis and detection of a Seaborgium carbonyl complex

Even, J.*; Yakushev, A.*; Dllmann, Ch. E.*; Haba, Hiromitsu*; Asai, Masato  ; Sato, Tetsuya   ; Brand, H.*; Di Nitto, A.*; Eichler, R.*; Fan, F. L.*; Hartmann, W.*; Huang, M.*; Jger, E.*; Kaji, Daiya*; Kanaya, Jumpei*; Kaneya, Yusuke; Khuyagbaatar, J.*; Kindler, B.*; Kratz, J. V.*; Krier, J.*; Kudo, Yuki*; Kurz, N.*; Lommel, B.*; Miyashita, Sunao*; Morimoto, Koji*; Morita, Kosuke*; Murakami, Masashi*  ; Nagame, Yuichiro ; Nitsche, H.*; Oe, Kazuhiro*; Qin, Z.*; Schdel, M.; Steiner, J.*; Sumita, Takayuki*; Takeyama, Mirei*; Tanaka, Kengo*; Toyoshima, Atsushi; Tsukada, Kazuaki  ; Trler, A.*; Usoltsev, I.*; Wakabayashi, Yasuo*; Wang, Y.*; Wiehl, N.*; Yamaki, Sayaka*

A new superheavy element complex, a seaborgium carbonyl, has been successfully synthesized, and its adsorption property has been studied using a cryo-thermochromatography and -detection apparatus COMPACT. Nuclear reaction products of short-lived Sg preseparated with a gas-filled recoil ion separator GARIS at RIKEN were directly injected into a gas cell filled with He/CO mixture gas, and chemical reaction products of volatile carbonyl complexes were trasported to COMPACT. The Sg carbonyl complex detected with COMPACT was found to be very volatile with adsorption enthalpy of 50 kJ/mol, from which we have concluded that this complex should be a Sg hexacarbonyl Sg(CO). This is the first synthesis of organometallic compounds of transactinide elements for which only simple inorganic comounds have been synthesized so far.