Potassium telluride

Potassium telluride is an inorganic compound with a chemical formula K2Te. It is formed from potassium and tellurium, making it a telluride.[2] Potassium telluride is a white powder. Like rubidium telluride and caesium telluride, it can be used as an ultraviolet detector in space. Its crystal structure is similar to other tellurides, which have an anti-fluorite structure.

Potassium telluride

K+: __ 　 Te2-: __
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.032.039
EC Number
  • 235-256-4
  • InChI=1S/2K.Te
    Key: JNKJTXHDWHQVDL-UHFFFAOYSA-N
  • [K][Te][K]
Properties
K2Te
Molar mass 298.64 g/mol
Appearance pale yellow powder,become grey when touched air[1]
Melting point 874 °C
Related compounds
Other anions
 Potassium oxide
Potassium sulfide
Potassium selenide
Potassium polonide
Other cations
 Lithium telluride
Sodium telluride
Rubidium telluride
Caesium telluride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Production

Tellurium will react with melting potassium cyanide (KCN) producing potassium telluride. It also can produced by direct combination of potassium and tellurium, usually in liquid ammonia solvent:[3]

Reactions

Adding potassium telluride to water and letting the filtrate stand in air leads to an oxidation reaction that generates potassium hydroxide (KOH) and elemental tellurium:[3][4]

References
  1. Sangester J. and Pelton AD; Journal of Phase Equilibria, 1997, 18(4) p. 394.
  1. Linda D. Schultz (October 1990). "Synthesis and characterization of potassium polytellurides in liquid ammonia solution". Inorganica Chimica Acta. 176 (2): 271–275. doi:10.1016/S0020-1693(00)84855-0. Retrieved 2019-11-23.
  2. Brigitte Eisenmann, Herbert Schäfer: K2Te3 : The First Binary Alkali-Metal Polytelluride with Te2−3-Ions. In: Angewandte Chemie International Edition in English. 17, 1978, S. 684, doi:10.1002/anie.197806841.
  3. Wolfgang A. Herrmann, Christian Erich Zybill (2014). Synthetic Methods of Organometallic and Inorganic Chemistry, Volume 4, 1997 Volume 4: Sulfur, Selenium and Tellurium. Georg Thieme Verlag. p. 191. ISBN 978-3-13-179191-7.
  4. Adolf Pinner (1885), Repetitorium Der Anorganischen Chemie [Repetitorium of Inorganic Chemistry] (in German), Рипол Классик, p. 116, ISBN 978-5-87746-719-4
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