Chemical Properties of Element 105 in Aqueous Solution: Halide Complex Formation and Anion Exchange into Triisoctyl Amine

Kratz, J. V.; Zimmermann, H. P.; Scherer, U. W.; Schädel, M.; Brüchle, W.; Gregorich, Κ. E.; Gannett, C. M.; Hall, H. L.; Henderson, R. A.; Lee, D. M.; Leyba, J. D.; Nurmia, M. J.; Hoffman, D. C.; Gäggeler, H.; Jost, D.; Baltensperger, U.; Ya, Nai-Qi; Türler, A.; Lienert, Ch. (1989). Chemical Properties of Element 105 in Aqueous Solution: Halide Complex Formation and Anion Exchange into Triisoctyl Amine. Radiochimica acta, 48(3-4), pp. 121-133. Oldenbourg 10.1524/ract.1989.48.34.121

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Studies of the halide complexation of element 105 in aqueous solution were performed on 34-s 262Ha produced in the 249Bk(18-O,5n) reaction. The 262Ha was detected by measuring the fission and alpha activities associated with its decay and the alpha decays of its daughter, 4.3-s 258Lr. Time-correlated pairs of parent and daughter alpha particles provided a unique identification of the presence of 262Ha. About 1600 anion exchange separations of 262Ha from HCl and mixed HC1/HF solutions were performed on a one-minute time scale. Reversed-phase micro-chromatographic columns incorporating triisooctyl amine (TIOA) on an inert support were used in the computer-controlled liquid chromatography apparatus, ARCA II. 262Ha was shown to be adsorbed on the column from either 12 M HCl/0.02 M HF or 10 M HCl solutions like its homologs Nb and Ta, and like Pa. In elutions with 4 M HCl/0.02 M HF (Pa-Nb fraction), and with 6 M HNO3/O.OI5 M HF (Ta fraction), the 262Ha activity was found in the Pa-Nb fraction showing that the anionic halide complexes are different from those of Ta, and are more like those of Nb and Pa. In separate elutions with 10 M HCl/0.025 M HF (Pa fraction) and 6 M HN03/0.015 M HF (stripping of Nb) the 262Ha was found to be equally divided between the Pa and Nb fractions. The non-tantalum like halide complexation of Ha is indicative of the formation of oxohalide or hydroxohalide complexes, like [NbOCU]" and [PaOCl4] or [Pa(OH)2Cl4]", at least for intermediate HCl concentrations, in contrast to the pure halide complexes in Ta, like [TaCl6]-.

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