Valence states of cyclotron-produced thallium

Tereshatov, E. E.; Semelová, Miroslava; Čubová, Kateřina; Bartl, P.; Němec, M.; Štursa, Jan; Zach, V.; Folden, C. M.; Omtvedt, Jon Petter; John, Jan

doi:10.1039/d0nj05198e

Cited by 8 publications

(3 citation statements)

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“…The exact cause of the absence of the reduced species is unclear at this point, but it could be due to the interaction of the ketone with AtO + . One probable explanation is that the trivalent oxidation state is stabilized by the complexation, as has been recently observed with Tl …”

Section: Resultsmentioning

confidence: 72%

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Complexation of Astatine(III) with Ketones: Roles of NO₃^–Counterion and Exploration of Possible Binding Modes

et al. 2022

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Ketones have been proven effective in extracting astatine(III) from aqueous solvents. Previous theoretical studies suggested a mechanism where the “sp2” lone pair on the carbonyl oxygen donates electron density into the π system of the AtO+ molecular cation to form a dative-type bond. In this study, co-extraction of NO3 – as AtO(NO3)·(OCR1R2) species into the organic phase appears to be a key factor. Adjusting the electronic properties of the ketone, by having an aryl group instead of an alkyl group in the alpha position of the ketone, increased the electron density on CO, increased the bond strength between the ketone and AtO+, and in turn increased the extraction of 211At into the organic phase. Extraction with diketones shows dependence on the bridging distance between the two carbonyl moieties, where a C3 or longer bridge results in a 10-fold increase in extraction into the organic phase. DFT calculations show the longer bridge allows for the chelation of AtO(NO3) by either the second carbonyl or the phenyl ring.

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Section: Resultsmentioning

confidence: 72%

“…One probable explanation is that the trivalent oxidation state is stabilized by the complexation, as has been recently observed with Tl. 66 Extraction as a Function of NaNO 3 . Next, as mentioned earlier, the effect on the extraction of 211 At while varying the nitrate anion concentration independent of acidity was examined.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Complexation of Astatine(III) with Ketones: Roles of NO₃^–Counterion and Exploration of Possible Binding Modes

et al. 2022

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“…For example, with ketones 17 and Tl 3+ complexation with Cl À . 72 Apparently, the TEVA data set does not have enough experimental points to determine the constants of HAtOCl 2 sorption.…”

Section: Dowex 1 â 8 and Teva Resinsmentioning

confidence: 99%

Ion exchange behavior of astatine and bismuth

et al. 2023

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Mechanism of astatine and bismuth sorption on extraction chromatography resins from nitric acid media

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et al. 2023

Chemical Engineering Journal

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Valence states of cyclotron-produced thallium

Abstract: Non-monovalent state of cyclotron-produced thallium in the reaction of accelerated 3He ions with gold.

Cited by 8 publications

References 64 publications

Complexation of Astatine(III) with Ketones: Roles of NO₃^–Counterion and Exploration of Possible Binding Modes

Complexation of Astatine(III) with Ketones: Roles of NO₃^–Counterion and Exploration of Possible Binding Modes

Ion exchange behavior of astatine and bismuth

Mechanism of astatine and bismuth sorption on extraction chromatography resins from nitric acid media

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Valence states of cyclotron-produced thallium

Abstract: Non-monovalent state of cyclotron-produced thallium in the reaction of accelerated 3He ions with gold.

Cited by 8 publications

References 64 publications

Complexation of Astatine(III) with Ketones: Roles of NO3–Counterion and Exploration of Possible Binding Modes

Complexation of Astatine(III) with Ketones: Roles of NO3–Counterion and Exploration of Possible Binding Modes

Ion exchange behavior of astatine and bismuth

Mechanism of astatine and bismuth sorption on extraction chromatography resins from nitric acid media

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Product

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Complexation of Astatine(III) with Ketones: Roles of NO₃^–Counterion and Exploration of Possible Binding Modes

Complexation of Astatine(III) with Ketones: Roles of NO₃^–Counterion and Exploration of Possible Binding Modes