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

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2022 Dec 23

PMID 36557790

Authors

Alexander G Medvedev

Oleg Yu Savelyev

Dmitry P Krutko

Alexey A Mikhaylov

Ovadia Lev

Petr V Prikhodchenko

Affiliations

Soon will be listed here.

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 O, Te, and Te 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, Cs[TeO(OH)] and Cs[TeO(OH)], 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.

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