Electrochemical Reduction and Related Thermodynamic Properties of Nobelium

David, F.; Samhoun, K.; Lougheed, R. W.; Dougan, R.J.; Wild, J. F.; Landrum, J.H.; Hulet, E.K.

doi:10.1524/ract.1990.51.2.65

Cited by 10 publications

(9 citation statements)

References 18 publications

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“…In the case of heavy elements: Fm [23,24], Md [24,25] and No [26] simple conclusions were drawn. The usual logarithmic transform of the waves corresponds to 30 mV and, therefore, since diffusion process is observed, two electrons are involved in the electrochemical reaction.…”

Section: Existence Of Low Oxidation States Of Lanthanides and Actinidmentioning

confidence: 97%

About low oxidation states, hydration and covalence properties of f elements

David¹

2008

Radiochimica Acta

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Lanthanides / Actinides / Redox properties / Hydration / CovalenceSummary. The existence of low oxidation states of lanthanides and actinides in aqueous solution has been reexamined in the light of recent data. The retained redox data corresponding to the 3 + /2+ couples are given, and earlier reports of the existence of monovalent mendelevium is not confirmed. By comparing divalent, trivalent and tetravalent ions, the effective charges of the lanthanide and actinide ions have been quantified. It is shown, based on experimental EXAFS data, and modelling of the aquo ions, that the covalent effect in these series increases with the oxidation state, is larger for actinides than for lanthanides and maximum for trivalent and tetravalent ions at the beginning of the series and, in each case, becoming negligible around the middle of the series. For divalent ions this covalent effect is small and constant through the series. Characteristics of the ions have been evaluated and hydration properties deduced.

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Section: Existence Of Low Oxidation States Of Lanthanides and Actinidmentioning

confidence: 97%

About low oxidation states, hydration and covalence properties of f elements

David¹

2008

Radiochimica Acta

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“…Radiochemical polarography has been applied to the determination of the amalgamation potentials of element 101 (mendelevium, Md) [5] and element 102 (nobelium, No) [6,7] where amalgamated metals were extracted into the mercury phase from aqueous solution. The amalgamation technique gives reduction potentials from the most stable oxidation states to amalgamated metallic-states.…”

Section: Introductionmentioning

confidence: 99%

Development of an electrochemistry apparatus for the heaviest elements

Toyoshima¹,

Kasamatsu²,

Kitatsuji³

et al. 2008

Radiochimica Acta

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Electrochemistry / Flow electrolytic cell / Chemically modified electrode / Redox reaction Summary. We developed a new apparatus for the study of electrochemical properties of the heaviest elements. The apparatus is based on a flow electrolytic cell combined with column chromatography. Glassy-carbon fibers modified with Nafion perfluorinated cation-exchange resin are used as a working electrode as well as a cation-exchanger. The elution behavior of 139 Ce with the number of 10 10 atoms in 0.1 M ammonium α-hydroxyisobutyric acid solution from the column electrode was investigated at the applied potentials of 0.2-1.0 V versus the Ag/AgCl reference electrode in 1.0 M LiCl. It was found that 139 Ce 3+ is successfully oxidized to 139 Ce 4+ even with tracer concentration at around the redox potential determined by cyclic voltammetry for the macro amounts of Ce with 10 17 atoms (10 −3 M). The present oxidation reaction and separation of Ce 4+ was accomplished within a few minutes.

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“…The radiopolarography method allows for reduction on a Hg electrode of Cm, Bk, Cf, Es, Fm, Md, or No ions to the metallic state at concentrations as low as 10 78 to 10 711 mol/dm 3 . The partial excess Gibbs energies of formation of these amalgams were estimated from the polarographic half-wave potentials by Nugent (1975), Samhoun and David (1979), and David et al (1990). Such estimations would not be possible with typical thermodynamic techniques used for macro amounts of these metals.…”

Section: Isotope Separation and Related Featuresmentioning

confidence: 99%