Formation and Spectra of Uranyl(V) Chloride in Molten Chloride Solvents

Wenz, Donald A.; Adams, Max D.; Steunenberg, R.K.

doi:10.1021/ic50017a014

Cited by 34 publications

(18 citation statements)

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“…The main discrepancy in the literature data [4,5,[9][10][11] concerns the possibility of the formation of uranium(IV) ions as a product of decomposition of uranyl(VI) chloride. Absorption spectroscopy offers a convenient way for identifying uranium ions in different oxidation states.…”

Section: Decomposition Of Uranyl(vi) Chloridementioning

confidence: 94%

“…Based on literature reports [4,5,[9][10][11], the following reactions, describing the thermal decomposition of uranyl(VI) chloride dissolved in a chloride melt, can be proposed: …”

Section: Decomposition Of Uranyl(vi) Chloridementioning

confidence: 99%

“…Several U(V) complexes have been characterized in organic solvents [3] and uranium(V) species are stable in ionic solvents. The electronic absorption spectra of uranyl(V) chloro-complexes in chloride melts were reported nearly half a century ago [4,5]. Electrochemical and thermodynamic [6], and structural [7] studies of UO 2 + in high-temperature chloride melts have subsequently been performed, and the behavior of uranium(V) in low-temperature melts has also been considered [8].…”

Section: Introductionmentioning

confidence: 99%

“…Wilks [9] reported that during the decomposition of uranyl(VI) chloride dissolved in a chloride melt Cl 2 is evolved and U 3 O 8 is precipitated. According to Wenz and Adams [4], uranyl(V) ions are formed in the melt below 750 °C: at higher temperatures UO 2 is precipitated and a small amount of U(IV) ions is formed in the melt. Adams [5] and Stromatt [10] attributed the formation of UO 2 + ions in the melt to the reaction between UO 2 2+ and uranium dioxide.…”

Section: Introductionmentioning

confidence: 99%

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On the formation of uranium(V) species in alkali chloride melts

Volkovich

Aleksandrov

Griffiths³

et al. 2010

Pure and Applied Chemistry

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Uranyl(V) species are normally unstable in solutions but are here shown to be stable in high-temperature chloride melts. Reactions leading to the formation of UO 2 Cl 4 3ions were studied, including thermal decomposition and chemical reduction of uranyl(VI) chlorospecies in various alkali chloride melts (LiCl, 3LiCl-2KCl, NaCl-KCl, and NaCl-2CsCl) at 550-850 °C. Decomposition of UO 2 Cl 4 2species under reduced pressure, with inert gas bubbling through the melt or using zirconium getter in the atmosphere results in the formation of UO 2 Cl 4 3and UO 2 . Elemental tellurium, palladium, silver, molybdenum, niobium, zirconium, and hydrogen, as well as niobium and zirconium ions were tested as the reducing agents. The outcome of the reaction depends on the reductant used and its electrochemical properties: uranyl(VI) species can be reduced to uranyl(V) and uranium(IV) ions, and to uranium dioxide.

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Section: Decomposition Of Uranyl(vi) Chloridementioning

confidence: 94%

“…Based on literature reports [4,5,[9][10][11], the following reactions, describing the thermal decomposition of uranyl(VI) chloride dissolved in a chloride melt, can be proposed: …”

Section: Decomposition Of Uranyl(vi) Chloridementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the formation of uranium(V) species in alkali chloride melts

Volkovich

Aleksandrov

Griffiths³

et al. 2010

Pure and Applied Chemistry

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“…However, the Potentiometrie data did not give conclusive data on the number of Chlorides coordinated to U(V). The UV-vis-NIR spectrum of U(V) in acidic AICI3-BPC was similar to that of UCU" in SOCI2 [10] and nitromethane [11]. Dai and co-workers [12] found that although U(V) is stable in acidic AICI3-EMIC, upon making the molten salt basic, U(V) is reduced to U(rV) by the free chloride ion present in the basic system.…”

Section: Introductionmentioning

confidence: 80%