Chalcogenide esters as reactive intermediates in selenium and tellurium purifications

Badesha, Santokh S.; Monczka, Paul; Smith, Steven D.

doi:10.1139/v83-383

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…The most convenient synthesis of 1 , however, was accomplished using Te(IV). Reactions involving common Te(IV) materials were investigated because reactions of TeO 2 with glycols have been established in the literature . TeO 2 is also attractive, given that it is a common Te-containing compound produced in current device recycling strategies .…”

Section: Resultsmentioning

confidence: 99%

“…Reactions involving common Te(IV) materials were investigated because reactions of TeO 2 with glycols have been established in the literature. 30 also attractive, given that it is a common Te-containing compound produced in current device recycling strategies. 31 Treating TeO 2 and stoichiometric quantities of dtbc in toluene with catalytic TsOH resulted in the complete consumption of TeO 2 within 30 min at room temperature.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

et al. 2021

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Tellurium catecholate complexes were investigated to probe the redox chemistry of tellurium, whose oxidation state can span from −2 to +6. Treating TeO 2 with catechols resulted in tellurium coordination complexes in high yields within minutes to hours at room temperature or with extended heating, depending on the ligand substituents, giving Te(IV) complexes of the form Te(C) 2 , where C = 3,5-di-tert-butylcatecholate, ocatecholate, or tetrachlorocatecholate. The redox behavior of these complexes was investigated through addition of organic oxidants, giving nearly quantitative adducts of pyridine N-oxide or N-methylmorpholine Noxide with each tellurium complex, the latter set leading to ligand oxidation upon heating. Each compound was characterized crystallographically and computationally, providing data consistent with a mostly electrostatic interaction and very little covalent character between the N-oxide and Te complex. The Te N-oxide bond orders are consistently lower than those with the catechol derivatives, as characterized with the Mayer, Gopinathan−Jug (G-J), and first Nalewajski−Mrozek (N-M1) bond indices. The tellurium lone pair is energetically buried by 1.93−2.81 eV, correlating with the observation that the ligands are more reactive than the tellurium center toward oxidation. This combined experimental and theoretical study finds structure−property relationships between ligand design and reactivity that will aid in future efforts for the recovery of tellurium.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

et al. 2021

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“…In the case of sulfur, there is no evidence for any type of reactivity with dtbc, and thus once removed from the metal, it is a spectator in solution which can then be later separated from CdCl 2 by washing with water. Te(dtbc) 2 can also be reduced to Te 0 using hydrazine monohydrate, which has been previously reported to reduce tellurane compounds [33] …”

Section: Resultsmentioning

confidence: 89%

“…Te(dtbc) 2 can also be reduced to Te 0 using hydrazine monohydrate, which has been previously reported to reduce tellurane compounds. [33] …”

Section: Resultsmentioning

confidence: 99%

Separation of Tellurium from Metal Chalcogenides through Mild Anhydrous Chlorination

Uible

Kieser

Bart

2022

Chemistry A European J

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The separation of tellurium from cadmium telluride is examined using a unique combination of mild, anhydrous chlorination and complexation of the subsequent tellurium tetrachloride with 3,5-di-tert-butylcatecholate ligands (dtbc). The resulting tellurium complex, Te(dtbc) 2 , is isolated in moderate yield and features a 10 3 to 10 4 reduction in cadmium content, as provided by XRF and ICP-MS analysis. Similar results were obtained from zinc telluride. A significant separation between Te, Se, and S was observed after treating a complex mixture of metal chalcogenides with this protocol. These three tunable steps can be applied for future applications of CdTe photovoltaic waste.

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Chapter 6 Elements of group 6

Barker¹

1983

Coordination Chemistry Reviews

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Chalcogenide esters as reactive intermediates in selenium and tellurium purifications

Cited by 10 publications

References 9 publications

Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

Synthesis and Characterization of Tellurium Catecholates and Their N-Oxide Adducts

Separation of Tellurium from Metal Chalcogenides through Mild Anhydrous Chlorination

Chapter 6 Elements of group 6

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