Speciation of Tellurium(VI) in Aqueous Solutions: Identification of Trinuclear Tellurates by 17O, 123Te, and 125Te NMR Spectroscopy

Alexander G. Medvedev, Oleg Yu Savelyev, Dmitry P. Krut’ko, Alexey A. Mikhaylov, Ovadia Lev*, Petr V. Prikhodchenko*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Tellurates have attracted the attention of researchers over the past decade due to their properties and as less toxic forms of tellurium derivatives. However, the speciation of Te(VI) in aqueous solutions has not been comprehensively studied. We present a study of the equilibrium speciation of tellurates in aqueous solutions at a wide pH range, 2.5–15 by 17O, 123Te, and 125Te NMR spectroscopy. The coexistence of monomeric, dimeric, and trimeric oxidotellurate species in chemical equilibrium at a wide pH range has been shown. NMR spectroscopy, DFT computations, and single-crystal X-ray diffraction studies confirmed the formation and coexistence of trimeric tellurate anions with linear and triangular structures. Two cesium tellurates, Cs2[Te4O8(OH)10] and Cs2[Te2O4(OH)6], were isolated from the solution at pH 5.5 and 9.2, respectively, and studied by single-crystal X-ray diffractometry, revealing dimeric and tetrameric tellurate anions in corresponding crystal structures.

Original languageAmerican English
Article number8654
JournalMolecules
Volume27
Issue number24
DOIs
StatePublished - Dec 2022

Bibliographical note

Publisher Copyright:
© 2022 by the authors.

Keywords

  • DFT computations
  • NMR spectroscopy
  • single-crystal X-ray diffraction
  • spin-spin coupling
  • tellurates
  • trinuclear tellurate

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