Tellurite is a oxyanion of tellurium with the formula TeO2−3. It is the ion of tellurous acid, and is chemically related to tellurium dioxide (TeO2), whose mineral appearance also bears the name tellurite. Tellurites are typically colorless or white salts, which in some ways are comparable to sulfite.[3]

Structure and reactions

Crystal structure of sodium tellurite, highlighting the pyramidal structure of the anion.

Tellurite dianion is pyramidal, like selenite and sulfite. The anion has C3vsymmetry.

Tellurites can be reduced to elemental tellurium by electrolysis or a strong reducing agent. When fused with nitrate salts, tellurite salts oxidize to tellurates (TeO2−4).

Upon acidification of aqueous solutions of tellurite salts, solid hydrated tellurium dioxide (TeO2) precipitates. This reaction allows the separation of tellurium from selenium since selenous acid remains soluble at low pH. The intermediate in the protonation occurs at oxygen to give [TeO2(OH)]−.

Compounds

  • Sodium tellurite
  • Potassium tellurite (K2TeO3) is used together with agar as part of a selective medium for growth of some bacteria (Clauberg medium). Corynebacteria and some other species reduce TeO2−3 to elemental Te, which stains the bacteria black.

Biological activity

Tellurit (TeO₃²⁻) ist ein hochgiftiges Oxyanion des Tellurs mit ausgeprägter biologischer Aktivität, insbesondere aufgrund seiner toxischen Wirkung auf verschiedene Organismen, darunter Bakterien, Pflanzen und Menschen. Das Fehlen der mitochondrialen Proteine ​​MRPL44, NAM9 (MNA6) und GEP3 (MTG3) in Hefen ist mit einer Telluritresistenz verbunden. [ 4 ]

Siehe auch

  • Liste der Tellurite

Referenzen

  1. ^ „Tellurige Säure – PubChem Public Chemical Database“ . Das PubChem-Projekt . USA: National Center for Biotechnology Information.
  2. ^ "Tellurit (CHEBI:30477)" . Chemische Substanzen von biologischem Interesse (ChEBI) . Vereinigtes Königreich: Europäisches Bioinformatik-Institut.
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemie der Elemente (2. Aufl.). Butterworth-Heinemann. doi : 10.1016/C2009-0-30414-6 . ISBN 978-0-08-037941-8Die
  4. ^ Del Giudice, Luigi; Alifano, Pietro; Calcagnile, Matteo; Di Schiavi, Elia; Bertapelle, Carla; Aletta, Mariarosaria; Pontieri, Paola (01.05.2022). „Mitochondriale ribosomale Proteingene im Zusammenhang mit Alzheimer und Telluritoxizität“ . Mitochondrium . 64 : 45–58 . doi : 10.1016/j.mito.2022.02.006 . ISSN 1567-7249 . 

Weiterführende Literatur

  • MR Masson, HD Lutz und B. Engelen (Hrsg.) „Sulfites, Selenites and Tellurites“, Pergamon Press, Oxford, 1986.