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SO
and HF/HCl solutions into toluene with Aliquat336; Sulfate and fluoride complex formation of Mo and W towards chemical studies of seaborgium (Sg)Toyoshima, Atsushi; Mitsukai, Akina; Tsukada, Kazuaki; Oe, Kazuhiro*; Haba, Hiromitsu*; Komori, Yukiko*; Murakami, Masashi; Kaneya, Yusuke*; Sato, Daisuke*; Asai, Masato; et al.
Journal of Radioanalytical and Nuclear Chemistry, 317(1), p.421 - 430, 2018/07
Times Cited Count：2 Percentile：20.55(Chemistry, Analytical)We have studied extraction behavior of group-6 elements Mo and W to search for suitable conditions for an on-line extraction experiment of their heavier homolog, seaborgium (Sg). Batch-wise extraction of carrier-free radiotracers 
Mo and 
W were carried out from 0.10 - 8.6 M HSO and 1.0
10
- 5.0 M HF/1.0 M HCl into toluene with a quaternary ammonium compound, Aliquat336. Anionic sulfate complexes of Mo and W with charge - 2 were extracted with Aliquat336 from HSO solutions with concentrations of [HSO] 
2 M. In HF/1.0 M HCl, oxyfluoro complexes of Mo and W with charge - 1 were interpreted to be formed and extracted with Aliquat336. From these results, favorable conditions for the extraction of Sg are discussed.
Komori, Yukiko*; Yokokita, Takuya*; Kasamatsu, Yoshitaka*; Haba, Hiromitsu*; Toyoshima, Atsushi; Toyomura, Keigo*; Nakamura, Kohei*; Kanaya, Jumpei*; Huang, M.*; Kudo, Yuki*; et al.
Journal of Radioanalytical and Nuclear Chemistry, 303(2), p.1385 - 1388, 2015/02
Times Cited Count：2 Percentile：17.42(Chemistry, Analytical)We studied solid-liquid extraction behavior of carrier-free Mo and W radiotracers onto an Aliquat 336-loaded resin from HCl solutions toward extraction chromatography experiments of element 106, seaborgium(Sg). Distribution coefficients (
) of Mo and W on the resin were determined as a function of HCl concentration by a batch method. On-line extraction chromatography of Mo and W was also carried out in 2-8 M HCl solutions with an automated rapid chemistry apparatus. The order of extraction probability from 2 to 8 M HCl was MoW, which reflected the order of the values in the batch experiment.
Even, J.*; Yakushev, A.*; D
llmann, Ch. E.*; Haba, Hiromitsu*; Asai, Masato; Sato, Tetsuya; Brand, H.*; Di Nitto, A.*; Eichler, R.*; Fan, F. L.*; et al.
Science, 345(6203), p.1491 - 1493, 2014/09
Times Cited Count：64 Percentile：83.38(Multidisciplinary Sciences)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.
Brchle, W.*; Andrassy, M.*; Angert, R.*; Eberhardt, K.*; Fricke, B.*; Gregorich, K. E.*; Gnther, R.*; Hartmann, W.*; Heimann, R.*; Hoffman, D. C.*; et al.
1st International Conference on the Chemistry and Physics of the Transactinide Elements; Extended Abstracts, 4 Pages, 1999/00
no abstracts in English
Tsukada, Kazuaki
Kagaku To Kogyo, 51(4), P. 615, 1998/00
no abstracts in English
M.Schaedel*; W.Bruechle*; E.Jaeger*; B.Schausten*; G.Wirth*; W.Paulus*; R.Guenther*; K.Eberhardt*; J.V.Kratz*; Seibert, A.*; et al.
Radiochimica Acta, 83(3), p.163 - 165, 1998/00
no abstracts in English
Otani, Ryo; Sato, Tetsuya; Aoki, Ryota*; Shirai, Kaori*; Suzuki, Hayato; Tsukada, Kazuaki; Asai, Masato; Ito, Yuta; Nagame, Yuichiro*; Sakama, Minoru*
no journal, ,
The adsorption enthalpy of the Sg dioxydichloride on a quartz surface (
(SgO
Cl)) has been reported to be -98 kJ/mol. The result, however, is still ambiguous because the value was evaluated based on a few experimental points with large statistics errors. To obtain a reliable (SgOCl)) for a discussion of an influence of relativistic effects, a stable gas chemistry apparatus with good reproducibility is mandatory. In this study, we have conducted offline experiments of an isothermal gas chromatography) with short-lived Mo isotopes originated from a 
Cf fission source. We searched for experimental parameters for an on-line experiment. At the presentation, we will present the obtained optimum conditions for gas chromatographic separation of group-6 elements and determined (MoOCl)).
Natori, Hina; Sato, Tetsuya; Asai, Masato; Ito, Yuta; Uchibaba, Yuta; Gong, G.; Tsukada, Kazuaki; Miyachi, Yuta; Nagame, Yuichiro*
no journal, ,
To elucidate the chemical properties of element 106, seaborgium (Sg), we have constructed an off-line isothermal gas chromatographic system. As a model experiment for Sg using the system, gas-phase chemical experiments were performed for volatile oxychlorides of short-lived molybdenum (Mo) isotopes, a homolog of Sg, produced in spontaneous fission of Cf. The optimum experimental conditions were obtained for isothermal gas chromatographic experiments using this apparatus. The observed isothermal gas chromatographic behaviors of short-lived Mo isotopes, we have successfully determined values of the adsorption enthalpies of Mo oxychlorides on the column surface. These values were in good agreement with those estimated from the sublimation enthalpies of the compounds.
Natori, Hina; Sato, Tetsuya; Asai, Masato; Ito, Yuta; Uchibaba, Yuta; Gong, G.; Tsukada, Kazuaki; Miyachi, Yuta; Nagame, Yuichiro*; Otani, Ryo; et al.
no journal, ,
We have conducted gas-phase chemical experiments to investigate the volatilities of group-6 compounds as a model experiment for element 106, seaborgium (Sg). In this study, an isothermal gas chromatographic (IGC) technique was employed for off-line and on-line gas phase studies of volatile oxychlorides of group-6 elements, molybdenum (Mo) and tungsten (W). The volatile oxychloride formation of Mo and W was examined under various conditions using their short-lived isotopes. Moreover, several isothermal gas chromatograms were obtained for the compounds. The evaluated - values were in good agreement with the estimated value for MoOCl and WOCl, respectively. We concluded that only MOCl (M=Mo, W) would be formed under the studied condition, and that adsorption enthalpies of MoOCl and WOCl were successfully obtained.
