Equilibrium among potassium polytellurides in N,N-dimethylformamide solution

McAfee, Jason L.; Andreatta, Jeremy R.; Ševčík, Richard; Schultz, Linda D.

doi:10.1016/j.molstruc.2012.04.038

Cited by 9 publications

(25 citation statements)

References 19 publications

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“…The obvious colour change in the TBP-Te stock solution is related to the formation of different polytellurides. The polytellurides with distinctive red, violet and pale rustic colour are assigned to Te3 2-, Te2 2and Te 2species, respectively, which is in agreement with the literature results reported by Schultz et al [22,23] The UV-vis absorption spectra of the polytelluride precursors are shown in Fig. 2.…”

Section: Resultssupporting

confidence: 90%

Synthesis of Atomically Thin CdTe Nanoplatelets by Using Polytelluride Tellurium Precursors

et al. 2021

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Colloidal two-dimensional (2D) semiconductor nanocrystals are of great importance due to their remarkable optical and electronic properties. Herein, shape-controllable synthesis of 2D wurtzite CdTe nanoplatelets (NPLs) by simply tailoring the reactivity of a tellurium (Te) precursor is reported. Ribbon-, shield-, and bullet-like 2D CdTe NPLs were prepared by a stepwise conversion from CdTe magic-size nanoclusters (MSNCs) by using Te32–, Te22–, and Te2– polytellurides as the tellurium precursor, respectively. This work not only develops a synthetic strategy capable of synthesising wurtzite CdTe nanoplatelets with controlled shapes by tailoring the reactivity of tellurium precursors but also gives insights into the growth mechanisms of colloidal 2D semiconductor nanocrystals.

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Section: Resultssupporting

confidence: 90%

Synthesis of Atomically Thin CdTe Nanoplatelets by Using Polytelluride Tellurium Precursors

et al. 2021

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“…Furthermore, the complete disappearance of the peaks, which might indicate any monotelluride species, indicates that the species Rb 2 Te 2 is a spectroscopically distinct species in liquid ammonia and does not exist in an equilibrium mixture similar to that observed for sodium polyselenides in liquid ammonia solution [17] or for the alkali metal polytellurides in other solvents. [9,21] CONCLUSIONS Spectral data are consistent with the conclusions of Klemm, Sodomann, and Langmesser [10] that the polytelluride species formed sequentially in liquid ammonia solution are Rb 2 Te, Rb 2 Te 2 , and Rb 2 Te 3 . These species do not undergo disproportionation reactions in liquid ammonia, and the reaction spectrum of rubidium ditelluride closely resembles those of the sodium and potassium ditellurides.…”

Section: Resultssupporting

confidence: 83%

Ultraviolet-Visible Spectroscopic Investigation of Reaction of Rubidium and Tellurium in Liquid Ammonia Solution

Poindexter

Schultz

2013

Spectroscopy Letters

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The sequential reaction of tellurium with rubidium in liquid ammonia solution has been monitored by ultraviolet-visible spectroscopy. Reaction times for rubidium with tellurium in liquid ammonia were markedly slower than those of sodium and potassium, and the ''yellow phase'' intermediate was long lived and exhibited a peak at approximately 330 nm with a broad shoulder at about 440 nm. Species formed agree with those previously reported: Rb 2 Te, Rb 2 Te 2 , and Rb 2 Te 3 . Rb 2 Te 2 solution was a violet-blue with absorbance peaks at 285.8, 324.3, 358.0, and 560.0 nm. No evidence of disproportionation reactions for rubidium polytellurides in liquid ammonia was observed.

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“…After half an hour, the DMF solution develops a faint pink color that intensifies to deep purple over the course of hours. The tellurium and alkali metal appear to react by physical contact resulting in the formation of Te 2− anions, which are soluble in DMF [18] . Those monotelluride anions react with remaining tellurium metal to form oligotellurides, which are linked by the equilibrium 1:

true Te^{2 -} + Te_{3}^{2 -} \vec{\leftarrow} 2 Te_{2}^{2 -}

…”

Section: Resultsmentioning

confidence: 99%

Chalcogenides by Reduction of their Dioxides in Ultra‐Alkaline Media

Albrecht

Ruck

2021

Angew Chem Int Ed

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The reaction of chalcogen dioxides ChO2 (Ch=Se, Te) with As2O3 in a 30 molar KOH hydroflux at about 200 °C yielded crystals of potassium trichalcogenides K2Ch3 with dimensions up to 2 cm. Arsenic trioxide acts as electron donor and is oxidized to arsenate(V). The new heterochalcogenide anion (TeSe2)2− formed when starting from SeO2 and TeO2 simultaneously. The compound K2TeSe2 crystallizes isostructural to K2S3 and K2Se3. The unexpected redox reaction as well as the precipitation of hygroscopic compounds from an aqueous solution are attributed to a strongly reduced activity of water. The reactions were studied by Raman and UV/Vis spectroscopy. Depending on the concentration of As2O3, colorless monochalcogenide Ch2− or orange Se22− and purple Te22− anions are dominating the solutions.

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Equilibrium among potassium polytellurides in N,N-dimethylformamide solution

Cited by 9 publications

References 19 publications

Synthesis of Atomically Thin CdTe Nanoplatelets by Using Polytelluride Tellurium Precursors

Synthesis of Atomically Thin CdTe Nanoplatelets by Using Polytelluride Tellurium Precursors

Ultraviolet-Visible Spectroscopic Investigation of Reaction of Rubidium and Tellurium in Liquid Ammonia Solution

Chalcogenides by Reduction of their Dioxides in Ultra‐Alkaline Media

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