The Spectrum of Potassium Hexachlororhenate(IV) in Fused Salts

Bailey, R. A.; McIntyre, John A.

doi:10.1021/ic50040a003

Cited by 15 publications

(9 citation statements)

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“…More intense bands, originating from the spin-allowed transitions, are situated at higher energies and could not be registered using the present experimental setup. The obtained energy values correspond to literature data [1,2,10]. No bands indicating the possible existence of Re(III) ions in NaCl or 3LiCl-2KCl melts were observed.…”

Section: Resultssupporting

confidence: 87%

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Speciation of Rhenium in Chloride Melts: Spectroscopic and Electrochemical Study

Danilov

Volkovich

Vasin

et al. 2008

Zeitschrift Für Naturforschung A

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Speciation of rhenium in high-temperature alkali chloride-based melts was studied using electronic absorption and IR spectroscopy of molten salts and diffuse reflectance spectroscopy of quenched melts. Rhenium was added to the melts by anodic dissolution of the metal (at anodic current densities of 0.005 - 0.05 A/cm2), by reacting Re and ReO2 with Cl2 and HCl, and by dissolving K2[ReCl6]. The melts included 3LiCl-2KCl and NaCl-2CsCl eutectics, an NaCl-KCl equimolar mixture, and pure NaCl, KCl and CsCl between 450 and 850 ◦C. Rhenium was present in the melts as Re(IV) hexachloro-ions, [ReCl6]2−; no evidence of species containing rhenium in oxidation states below four was obtained. The kinetics of [ReCl6]2− disproportionation in molten alkali chlorides were investigated, and the IR spectra of [ReO4]− ions in molten CsCl-CsI and CsI were measured for the first time.

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Section: Resultssupporting

confidence: 87%

“…Electronic absorption spectra of solutions of K 2 [ReCl 6 ] have been measured in molten 3LiCl-2KCl eutectic and dimethyl sulfone between 135 and 600 • C [1]. The behaviour of Re(III) chloride species, Re 3 Cl 9 , [Re 3 Cl 12 ] 3− and [Re 2 Cl 8 ] 2− , in the same melts has also been investigated [2].…”

Section: Introductionmentioning

confidence: 99%

Speciation of Rhenium in Chloride Melts: Spectroscopic and Electrochemical Study

Danilov

Volkovich

Vasin

et al. 2008

Zeitschrift Für Naturforschung A

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“…In SEC, when the thin layer electrode potential is held positive of this first reduction wave the UV-visible spectrum shows a slight change in the molar absorptivities of the bands for [ReC16] 3-+ [ReC16] "~----> [Re2CI~,] -~ + 3C1- [5] where X = other products. The reaction shown in Eq.…”

Section: 274mentioning

confidence: 99%

Spectroscopy, Electrochemistry, and Spectroelectrochemistry of Rhenium Chlorides in the AlCl3 ‐ NaClsat Melt

Hondrogiannis

Mamantov

1995

J. Electrochem. Soc.

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The electrochemical and UV-visibie spectroscopic and spectroelectrochemical behavior of rhenium(IV), added as K~ReCI~, and the metal-metal bonded rhenium(III) complexes, [Bu~N]~Re~CI~ and Re~CI~, was studied in the A1C13-NaClsa t melt at 175~ In the initial voltammograms of solutions containing [ReCl~] 2-a new wave grows in at a potential more positive than the [ReC16] ~-reduction. The resulting voltammogram, consisting of three reduction and two oxidation waves, does not change further. Spectroelectrochemical results indicate that this first reduction is due to the [ReCI~]~-/[Re2CI~] ~-couple. The second wave is believed to be due to the reductions of both [ReCI~] 2-and [Re2CI~] 2-. The results are complicated by the instability of the intermediates as well as the disproportionation of Re, C1, to [ReCI~] ~-and rhenium metal.

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“…17,18 One area where there have been several previous studies is in the speciation of rhenium in chloride-based melts. Bailey and McIntyre 19 have measured spectra of rhenium(IV) chloro-species in LiCl-KCl melt between 400 and 600 C and these were y On leave from: Department of Rare Metals, Ural State Technical University-UPI, Ekaterinburg, 620002, Russian Federation. 2À and rhenium metal.…”

Section: Introductionmentioning

confidence: 99%

Reactions and speciation of technetium and rhenium in chloride melts: a spectroscopy study

Volkovich

May

Charnock

et al. 2002

Phys. Chem. Chem. Phys.

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The reactions of rhenium metal, rhenium oxides (ReO 2 and ReO 3 ) and technetium dioxide with chlorine and hydrogen chloride were investigated in LiCl-KCl, NaCl-CsCl and NaCl-KCl based melts between 450 and 720 C. Reaction progress was followed using in situ electronic absorption spectroscopy, with the spectra measured between 200 and 1100 nm. Samples of the quenched melts were analysed by EXAFS spectroscopy. Rhenium metal and rhenium oxides react with Cl 2 or HCl yielding hexachlororhenate(IV) species, although the reaction of rhenium metal with HCl is extremely slow even at 700 C and no reaction between rhenium metal and Cl 2 was observed below 500 C. Chlorination of technetium dioxide in molten salts has been studied here for the first time. TcO 2 reacts with HCl producing [TcCl 6 ] 2À . However, the reaction of TcO 2 with chlorine results in the oxidation of technetium to pertechnetate which is retained in the melt and production of a volatile solid, which is possibly a mixture of Tc(IV) chloride and Tc(VII) oxychloride. This is the first reported investigation into Tc speciation in molten salts.

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The Spectrum of Potassium Hexachlororhenate(IV) in Fused Salts

Cited by 15 publications

References 0 publications

Speciation of Rhenium in Chloride Melts: Spectroscopic and Electrochemical Study

Speciation of Rhenium in Chloride Melts: Spectroscopic and Electrochemical Study

Spectroscopy, Electrochemistry, and Spectroelectrochemistry of Rhenium Chlorides in the AlCl3 ‐ NaClsat Melt

Reactions and speciation of technetium and rhenium in chloride melts: a spectroscopy study

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