Application of a novel gas phase synthesis approach to carbonyl complexes of accelerator-produced 5d transition metals

Michael Götz, Alexander Yakushev, Stefan Götz, Antonio Di Nitto, Christoph E. Düllmann, Masato Asai, Birgit Kindler, Jörg Krier, Bettina Lommel, Yuichiro Nagame, Tetsuya K. Sato, Hayato Suzuki, Tomohiro Tomitsuka, Katsuyuki Tokoi, Atsushi Toyoshima, Kazuaki Tsukada

Research output: Contribution to journalArticlepeer-review


In 2014 the first synthesis of a transactinide carbonyl complex - seaborgium hexacarbonyl - was reported. This was achieved in gas-phase chemical experiments in a beam-free environment behind the recoil separator GARIS. Extending this work to heavier elements requires more efficient techniques to synthesize carbonyl complexes as production rates of transactinide elements drop with increasing atomic number. A novel approach was thus conceived, which retains the benefit of a beam-free environment but avoids the physical preseparation step. The latter reduces the yields for products of asymmetric reactions such as those used for the synthesis of suitable isotopes of Sg, Bh, Hs and Mt. For this a series of experiments with accelerator-produced radioisotopes of the lighter homologues W, Re and Os was carried out at the tandem accelerator of JAEA Tokai, Japan. A newly developed double-chamber system, which allows for a decoupled recoil ion thermalization and chemical complex formation, was used, which avoids the low-efficiency physical preseparation step. Here, we demonstrate the feasibility of this newly developed method using accelerator-produced short-lived radioisotopes of the 5d homologues of the early transactinides.

Original languageEnglish
Pages (from-to)75-86
Number of pages12
JournalRadiochimica Acta
Issue number2
Publication statusPublished - Feb 1 2022

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry


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