Decomposition studies of group 6 hexacarbonyl complexes. Part 1: Production and decomposition of Mo(CO)6 and W(CO)6

I. Usoltsev, R. Eichler, Y. Wang 3 , J. Even, A. Yakushev 5 , H. Haba 7 , M. Asai 8 , H. Brand 5 , A. Di Nitto 6 , Ch.E. Düllmann, F. Fangli 3 , W. Hartmann 5 , M. Huang 7 , E. Jäger 5 , D. Kaji 7 , J. Kanaya 7 , Y. Kaneya 8 , J. Khuyagbaatar, B. Kindler 5 , J.V. Kratz 6 , J. Krier 5 , Y. Kudou 7 , N. Kurz 5 , B. Lommel 5 , S. Miyashita, K. Morimoto 7 , K. Morita, M. Murakami, Y. Nagame 8 , H. Nitsche, K. Ooe 11 , T.K. Sato 8 , M. Schädel 8 , J. Steiner 5 , P. Steinegger, T. Sumita 7 , M. Takeyama 7 , K. Tanaka 7 , A. Toyoshima 8 , K. Tsukada 8 , A. Türler, Y. Wakabayashi 7 , N. Wiehl, S. Yamaki 7  and Z. Qin 3
  • 1 University of Bern, 3012 Bern, Switzerland
  • 2 Paul Scherrer Institute, 5232 Villigen, Switzerland
  • 3 Institute of Modern Physics Lanzhou, Chinese Academy of Sciences, 730000 Lanzhou, China
  • 4 Helmholtz-Institut Mainz, 55099 Mainz, Germany
  • 5 GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 6 Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
  • 7 Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
  • 8 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 9 Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
  • 10 Kyushu University, Higashi-Ku, Fukuoka, 812-8581, Japan
  • 11 Niigata University, Niigata, Niigata 950-2181, Japan
  • 12 University of California, Berkeley, CA 94720-1460, USA
  • 13 Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8169, USA
  • 14 recently at TRIUMF, Vancouver, BC V6T 2A3, Canada

Abstract

Chemical studies of superheavy elements require fast and efficient techniques, due to short half-lives and low production rates of the investigated nuclides. Here, we advocate for using a tubular flow reactor for assessing the thermal stability of the Sg carbonyl complex – Sg(CO)6. The experimental setup was tested with Mo and W carbonyl complexes, as their properties are established and supported by theoretical predictions. The suggested approach proved to be effective in discriminating between the thermal stabilities of Mo(CO)6 and W(CO)6. Therefore, an experimental verification of the predicted Sg–CO bond dissociation energy seems to be feasible by applying this technique. By investigating the effect of 104,105Mo beta-decay on the formation of 104,105Tc carbonyl complex, we estimated the lower reaction time limit for the metal carbonyl synthesis in the gas phase to be more than 100 ms. We examined further the influence of the wall material of the recoil chamber, the carrier gas composition, the gas flow rate, and the pressure on the production yield of 104Mo(CO)6, so that the future stability tests with Sg(CO)6 can be optimized accordingly.

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Radiochimica Acta publishes original papers, review articles, and “rapid communications” (short articles of a more timely interest) on all chemical aspects of nuclear science and technology. The journal is geared toward scientists who are actively engaged in research work.

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