Adsorption of Nb, Ta and Pa on anion-exchanger in HF and HF/HNO3 solutions: Model experiments for the chemical study of Db

Kasamatsu, Y.; Toyoshima, Atsushi; Haba, Hiromitsu; Toume, H.; Akiyama, Kazuhiko; Yoshimura, Takashi; Nagame, Y.

doi:10.1007/s10967-007-7320-6

Cited by 15 publications

(16 citation statements)

References 24 publications

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“…Kasamatsu et al 52 and Monroy-Guzman et al 53 reported that [NbOF 4 ] − is present at fluoride concentrations of 2.0 × 10 −4 and 3.0 × 10 −3 M, [NbOF 5 ] 2− is the dominant species at [F − ] = 8.9 × 10 −3 −1.9 × 10 −2 M, and [NbF 6 ] − and [NbF 7 ] 2− are formed when [F − ] > 11 M. Throughout these concentrations, [NbOF 5 ] 2− is present in varying quantities. 52 In this study under hydrothermal conditions, the mole ratio of dpa:Nb appears to be the controlling factor in the crystal growth of [Hdpa] 2 NbOF 5 •2H 2 O (I) versus HdpaNbOF 4 (II). The niobium oxide-fluoride anion [NbOF 4 ] − of (II) forms in a solution with a mole ratio of dpa:Nb < 2:1.…”

Section: ■ Resultsmentioning

confidence: 99%

Nonlinear Active Materials: An Illustration of Controllable Phase Matchability

Gautier

Donakowski

et al. 2013

J. Am. Chem. Soc.

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For a crystal to exhibit nonlinear optical (NLO) activity such as second-harmonic generation (SHG), it must belong to a noncentrosymmetric (NCS) space group. Moreover, for these nonlinear optical (NLO) materials to be suitable for practical uses, the synthesized crystals should be phase-matchable (PM). Previous synthetic research into SHG-active crystals has centered on (i) how to create NCS compounds and/or (ii) how to obtain NCS compounds with high SHG efficiencies. With these tactics, one can synthesize a material with a high SHG efficiency, but the material could be unusable if the material was nonphase-matchable (non-PM). To probe the origin of phase matchability of NCS structures, we present two new chemically similar hybrid compounds within one composition space: (I) [Hdpa]2NbOF5·2H2O and (II) HdpaNbOF4 (dpa = 2,2'-dipyridylamine). Both compounds are NCS and chemically similar, but (I) is non-PM while (II) is PM. Our results indicate--consistent with organic crystallography--the arrangement of the organic molecule within hybrid materials dictates whether the material is PM or non-PM.

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Section: ■ Resultsmentioning

confidence: 99%

Nonlinear Active Materials: An Illustration of Controllable Phase Matchability

Gautier

Donakowski

et al. 2013

J. Am. Chem. Soc.

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“…9. As discussed in [65] Recently, chemical identification of Db as a decay product of element 115 produced in the reaction 243 Am + 48 Ca was performed [68][69][70]. A 32-cm 2 rotating target consisting of the enriched isotope 243 Am in the oxide form was bombarded by a 247-MeV 48 Ca beam at the U-400 cyclotron at the Flerov Laboratory of Nuclear Reactions (FLNR), Dubna, Russia.…”

Section: Dubnium (Db Z = 105)mentioning

confidence: 99%

Chemical studies of elements with Z≥ 104 in liquid phase

2015

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“…The inversion of the sequence of adsorption and extraction probabilities of Ta, Nb, and Pa on an anion-exchange resin from 0.31 M HF/0.1 M HNO 3 [193] and into Aliquat 336 from 0.5 M HF [198] was not discussed in [193]. Earlier work [200], however, indicates that this is due to the presence of 0.1 M HNO 3 .…”

Section: Liquid-phase Chemistrymentioning

confidence: 99%

Chemistry of superheavy elements

Schädel

2012

Radiochimica Acta

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Summary. The chemistry of superheavy elements -or transactinides from their position in the Periodic Table -is summarized. After giving an overview over historical developments, nuclear aspects about synthesis of neutron-rich isotopes of these elements, produced in hot-fusion reactions, and their nuclear decay properties are briefly mentioned. Specific requirements to cope with the one-atom-at-a-time situation in automated chemical separations and recent developments in aqueous-phase and gas-phase chemistry are presented. Exciting, current developments, first applications, and future prospects of chemical separations behind physical recoil separators ("pre-separator") are discussed in detail. The status of our current knowledge about the chemistry of rutherfordium (Rf, element 104), dubnium (Db, element 105), seaborgium (Sg, element 106), bohrium (Bh, element 107), hassium (Hs, element 108), copernicium (Cn, element 112), and element 114 is discussed from an experimental point of view. Recent results are emphasized and compared with empirical extrapolations and with fully-relativistic theoretical calculations, especially also under the aspect of the architecture of the Periodic Table.

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Adsorption of Nb, Ta and Pa on anion-exchanger in HF and HF/HNO3 solutions: Model experiments for the chemical study of Db

Cited by 15 publications

References 24 publications

Nonlinear Active Materials: An Illustration of Controllable Phase Matchability

Nonlinear Active Materials: An Illustration of Controllable Phase Matchability

Chemical studies of elements with Z≥ 104 in liquid phase

Chemistry of superheavy elements

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