The Electronic Structure of Anionic Halide Complexes of Element 105 in Aqueous Solutions and Their Extraction by Aliphatic Amines

Pershina, V.; Fricke, B.; Kratz, Jens Volker; Ionova, G. V.

doi:10.1524/ract.1994.64.1.37

Cited by 47 publications

(66 citation statements)

References 12 publications

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“…The [118]. By applying Born's theory of phase transition between the aqueous phase and the organic phase (mixed HCl/HF solutions and TiOA [77]) the extraction sequence Pa > Db > Nb was predicted, which is the inverse of that observed experimentally [77].…”

Section: J V Kratzmentioning

confidence: 90%

Critical evaluation of the chemical properties of the transactinide elements (IUPAC Technical Report)

Kratz¹

2003

Pure and Applied Chemistry

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Names of countries given after Members' names are in accordance with the IUPAC Handbook 1998Handbook -1999. Republication Abstract: In this paper, the chemical properties of the transactinide elements rutherfordium, Rf (element 104); dubnium, Db (element 105); and seaborgium, Sg (element 106) are critically reviewed. The experimental methods for performing rapid chemical separations on a time scale of seconds are reviewed, and comments are given on the special situation with the transactinides for which the chemistry has to be studied with single atoms. There follows a systematic description of theoretical predictions and experimental results on the chemistry of Rf, Db, and Sg-their mutual comparison and evaluation. The literature cited has the cutoff date of March 1999. The more recent chemical identification of bohrium, Bh (element 107), and of hassium, Hs (element 108), should be evaluated in a future Part II of this report.

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Section: J V Kratzmentioning

confidence: 90%

Critical evaluation of the chemical properties of the transactinide elements (IUPAC Technical Report)

Kratz¹

2003

Pure and Applied Chemistry

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“…. They also found that tantalum has a tendency to form the pure hexahalide [ TaCl 6 ] 2- [Pershina 1994]. Tantalum's special place in the group is thought to be due to it being at a position in the group where "some effects are compensated by the others"; i.e., where the relativistic effects, which are expected to decrease the radius, are counterbalanced by the radial expansion expected due to the addition of another electronic shell.…”

Section: Hahniummentioning

confidence: 99%

“…Previously, Pershina et al predicted, based on the size of the complexed ions, that protactinium should have a higher partition coefficient than niobium, with hahnium in the middle between the two [Pershina 1994]. …”

Section: Hahniummentioning

confidence: 99%

Properties of Group Five and Group Seven transactinium elements

Wilk

2001

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The detection and positive identification of the short-lived, low cross section isotopes used in the chemical studies of the heaviest elements are usually accomplished by measuring their α-decay, thus the nuclear properties of the heaviest elements must be examined simultaneously with their chemical properties. The isotopes 224 Pa and 266,267 Bh have been studied extensively as an integral part of the investigation of the heaviest members of the groups five and seven of the periodic table.The half-life of 224 Pa was determined to be 855±19 ms by measuring its α-decay using our rotating wheel, solid state detector system at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. Protactinium was produced by bombardment of a bismuth target. New neutron rich isotopes, MeV.The chemical behavior of hahnium, Ha (element 105) was investigated using the fast on-line continuous liquid extraction and detection system SISAK-LISSY.Hahnium was not observed in this experiment following transport and extraction.Protactinium was used as on-line test of the apparatus to determine the experimental efficiency of the entire system. Unfortunately, the amount of protactinium observed after the extraction, compared to the amount produced, was extremely small, only 2.5%. The extraction of the protactinium test isotope indicated the efficiency of the apparatus was too low to observe the extraction of hahnium.The chemical behavior of oxychloride compounds of bohrium was investigated by isothermal gas adsorption chromatography in a quartz column at 180, 150, and 75°C. It was found to be less volatile than the corresponding compounds of the lighter group seven homologues, rhenium and technetium, which had been measured previously with the same apparatus. Assuming the bohrium compound to be BhO 3 Cl, the evaluated standard adsorption enthalpy, ∆H ads , of BhO 3 Cl on the quartz surface was calculated from Monte Carlo fits to the volatility data to be DedicationThis thesis is dedicated to the Reed Reactor Facility (RRF) of Reed College, Portland, Oregon and the Summer School in Nuclear Chemistry that was sponsored by the Division of Nuclear Chemistry and Technology of the American Chemical Society. These two institutions have maintained a commitment to undergraduate education in the field of nuclear chemistry that is unparalleled. It is my hope that Reed will soon replace the long missing radiochemistry professor of the chemistry department to echo this commitment to nuclear and radiochemistry. Without the education and the experience I received from the RRF and the contacts I made at the ACS summer school, I certainly would not be writing this thesis. No changes were made to the structure of the Periodic Table until 1944, when Glenn T. Seaborg postulated the existence of the actinide series, analogous to the lanthanide series (see Figure 1.1) [Seaborg 1945]. This seemingly simple extrapolation was not obvious given the data at the time, and led to the nearly immediate discovery of americium and curium. Before Seaborg's fo...

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“…This still more difficult and complex theoretical problem was undertaken by Pershina and coworkers in conjunction with our initial international collaboration of scientists from the USA, Germany, Switzerland, and Russia to perform experimental studies of the compounds of the heaviest elements. Systematic theoretical studies of heavyelement compounds using relativistic quantum-chemical calculations were combined with fundamental physicochemical considerations to make detailed predictions (23,24 ) of the volatilities of the halides and the partitioning of the transactinides and their lighter homologues between aqueous and organic solvents for specific experimental conditions. Pershina and Fricke (25) have recently completed a review of theoretical studies of the molecular properties of the transactinides.…”

Section: Theorymentioning

confidence: 99%

Chemistry of the Heaviest Elements- One Atom at a Time

Hoffman

Lee

1999

J. Chem. Educ.

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FutureMore "In-Depth" Chemical Studies Chemistry beyond Seaborgium? 93 NpIn keeping with the goal of the Viewpoints series of the Journal of Chemical Education, this article gives a 75-year perspective of the chemistry of the heaviest elements, including a 50-year retrospective view of past developments, a summary of current research achievements and applications, and some predictions about exciting, new developments that might be envisioned within the next 25 years. A historical perspective of the importance of chemical separations in the discoveries of the transuranium elements from neptunium (Z = 93) through mendelevium (Z = 101) is given. The development of techniques for studying the chemical properties of mendelevium and still heavier elements on the basis of measuring the radioactive decay of a single atom ("atom-at-a-time" chemistry) and combining the results of many separate experiments is reviewed. The influence of relativistic effects (expected to increase as Z 2 ) on chemical properties is discussed. The results from recent atom-at-a-time studies of the chemistry of the heaviest elements through seaborgium (Z = 106) are summarized and show that their properties cannot be readily predicted based on simple extrapolation from the properties of their lighter homologues in the periodic table. The prospects for extending chemical studies to still heavier elements than seaborgium are considered and appear promising.

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The Electronic Structure of Anionic Halide Complexes of Element 105 in Aqueous Solutions and Their Extraction by Aliphatic Amines

Cited by 47 publications

References 12 publications

Critical evaluation of the chemical properties of the transactinide elements (IUPAC Technical Report)

Critical evaluation of the chemical properties of the transactinide elements (IUPAC Technical Report)

Properties of Group Five and Group Seven transactinium elements

Chemistry of the Heaviest Elements- One Atom at a Time

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